3,81 mm Wide Magnetic Tape Cartridge for Information Interchange - Helical Scan Recording - DDS-2 Format using 120 m Length Tapes

Transcription

1 Standard ECMA-198 2nd Edition - June 1995 Standardizing Information and Communication Systems 3,81 mm Wide Magnetic Tape Cartridge for Information Interchange - Heica Scan Recording - DDS-2 Format using 120 m Length Tapes Phone: Fax: URL: - Internet: hepdesk@ecma.ch

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3 Standard ECMA-198 2nd Edition - June 1995 Standardizing Information and Communication Systems 3,81 mm Wide Magnetic Tape Cartridge for Information Interchange - Heica Scan Recording - DDS-2 Format using 120 m Length Tapes Phone: Fax: URL: - Internet: hepdesk@ecma.ch MB - ECMA-198.DOC :23

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5 Brief History ECMA have produced a series of ECMA Standards for cassettes and cartridges containing magnetic tapes of different width and characteristics. Of these, the foowing reate to heica scan recording. ECMA-139 (1990) 3,81 mm Wide Magnetic Tape Cartridge for Information Interchange - Heica Scan Recording - DDS format ECMA-145 (1990) 8 mm Wide Magnetic Tape Cartridge for Information Interchange - Heica Scan Recording ECMA-146 (1990) 3,81 mm Wide Magnetic Tape Cartridge for Information Interchange - Heica Scan Recording - DATA/DAT Format ECMA-150 (1991) 3,81 mm Wide Magnetic Tape Cartridge for Information Interchange - Heica Scan Recording - DDS-DC Format using 60 m and 90 m Length Tapes, 2nd Edition ECMA-169 (1992) 8 mm Wide Magnetic Tape Cartridge, Dua Azimuth Format for Information Interchange- Heica Scan Recording ECMA-170 (1992) 3,81 mm Wide Magnetic Tape Cartridge for Information Interchange - Heica Scan Recording - DDS Format using 60 m and 90 m Length Tapes ECMA-171 (1992) 3,81 mm Wide Magnetic Tape Cartridge for Information Interchange - Heica Scan Recording - DATA/DAT-DC Format using 60 m and 90 m Length Tapes DDS Standard ECMA-139 defines a specification for data interchange using 3,81 mm wide magnetic tape cartridges. A derivative Standard ECMA-150 defines another data interchange specification for the same cartridges, but with a recorded format, namey DDS-DC, which enabes data to be compressed by the drive before being recorded. This ECMA Standard defines a specification, based on the features of both of these, which offers a further increase in data capacity. The primary change to the recorded format is an increase in the track density by a factor of 1,5. This produces a corresponding increase in data capacity for a cartridge of a given tape ength. Such a track density, when recorded on a cartridge tape whose tape ength is 125 metres, wi provide a storage capacity of 4 Gigabytes of uncompressed user data and typicay 8 to 16 Gigabytes of compressed user data. The design phiosophy is one of minimum change to the track format which is common to DDS and DDS-DC. This wi aid the deveopment of drives that support this DDS-2 format by derivation from existing products. It wi aso ease the deveopment of drives that are abe to support both previous formats as we as this format, thus providing the backwards compatibiity which the market demands. However, it is not a requirement for compiance to this specification that a drive aso reads and writes either the DDS format or the DDS-DC format. Nor is it a requirement for compiance to this specification that a drive compresses data and writes it in entities on the tape, or that a drive decompresses data contained within entities on the tape. A the recording on one cartridge wi be at the same track density, either that of DDS and DDS-DC, or that of DDS-2. The media coating and the track density are indicated by the combination of the states of the Recognition Hoes on the cartridge case. This ECMA Standard aso incudes the specifications of the Media Recognition System, namey a striped spicing tape. Adopted by the Genera Assemby of June 1995 as 2nd Edition of Standard ECMA-198.

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7 - i - Tabe of contents Page Section 1 - Genera 1 1 Scope 1 2 Conformance Magnetic tape cartridge Generating drive Receiving drive 1 3 References 2 4 Definitions Absoute Frame Number (AFN) a.c. erase Access Point agorithm Area ID Automatic Track Finding (ATF) Average Signa Ampitude azimuth back surface byte cartridge Channe Bit Codeword Data Format ID Eary Warning Point (EWP) End of Data (EOD) Entity Error Correcting Code (ECC) fux transition position fux transition spacing Frame Housekeeping Frame Logica Beginning of Tape (LBOT) magnetic tape Master Standard Ampitude Caibration Tape Master Standard Reference Tape Optimum Recording Fied Partition Boundary Physica Beginning of Tape (PBOT) Physica End of Tape (PEOT) physica recording density pre-recording condition processing processed data Processed Record Processed Record Sequence record Reference Recording Fied reprocessing 4

8 - ii Secondary Standard Ampitude Caibration Tape Secondary Standard Reference Tape Separator Mark Standard Reference Ampitude Tape Reference Edge Test Recording Current track unprocessed data Unprocessed Record Virtua End of Tape (VEOT) 5 5 Environment and safety Testing environment Operating environment Storage environment Transportation Safety Fammabiity 6 Section 2 - Requirements for the case 6 6 Dimensiona and mechanica characteristics of the case Genera Overa dimensions Loading grip Hoding areas Notches of the id Lid dimensions Optica detection of the beginning and end of tape Bottom side Locking mechanism of the sider Access hoes Recognition, sub-datums, and write-inhibit hoes Datum hoes Access room for tape guides Hoes for accessing the hubs Interna structure of the ower haf Light path Support Areas Datum Areas Reationship between Support and Datum Areas and Reference Pane Z Hubs Attachment of eader and traier tapes Interface between the hubs and the drive spindes Opening of the id Reease of the hub ocking mechanism Labe areas Requirement for autooaders 15 Section 3 - Requirements for the unrecorded tape 27 7 Mechanica, physica and dimensiona characteristics of the tape Materias Tape ength 28

9 - iii Length of magnetic tape Length of eader and traier tapes Length of spicing tapes Tape width Width of magnetic, eader and traier tapes Width and position of spicing tape Discontinuities Tape thickness Thickness of magnetic tape Thickness of eader and traier tape Thickness of spicing tape Longitudina curvature Cupping Coating adhesion Layer-to-ayer adhesion Tensie strength Breaking strength Yied strength Residua eongation Fexura rigidity Eectrica resistance of coated surfaces Light transmittance of the tape Media Recognition System (MRS) 31 8 Magnetic recording characteristics Optimum Recording Fied Signa Ampitude Resoution Overwrite Physica recording densities of 750,0 ftpmm and 2 999,9 ftpmm Physica recording densities of 83,3 ftpmm and 1 000,0 ftpmm Ease of erasure Tape quaity Missing puses Missing puse zone Signa-to-Noise Ratio (S/N) characteristic 34 Section 4 - Requirements for an interchanged tape 34 9 Format Genera Basic Groups Entity Group Information Tabe Bock Access Tabe (BAT) Sub-Groups G1 Sub-Group G2 Sub-Group - randomizing G3 Sub-Group G4 Sub-Group Main Data Bock 48

10 - iv Sub-Data Area Pack Item Number Pack Item Number Pack Item Number Pack Item Number Pack Item Number Pack Item Number Pack Item Number Pack Item Number Sub Data Bock Method of recording Physica recording density Long-term average bit ce ength Short-term average bit ce ength Rate of change Bit shift Read signa ampitude Maximum recorded eves Track geometry Track configuration Average track pitch Variations of the track pitch Track width Track ange Track edge inearity Track ength Idea tape centreine Azimuth anges Recording of Bocks on the tape Recorded Main Data Bock Recorded Sub Data Bock Margin Bocks, Preambe Bocks and Postambe Bocks Spacer Bocks Format of a track Track capacity Positioning accuracy Tracking scheme Layout of a Singe Data Space tape Device Area Reference Area Position Toerance Band No System Area System Preambe System Log System Postambe Position Toerance Band No Vendor Group Preambe Data Area 66

11 - v Vendor Group Recorded Data Group ECC Mutipe Recorded Instances Repeated Frames Appending and overwriting EOD Area Post-EOD Area Eary Warning Point - EWP Initiaization Layout of partitioned tape Overa magnetic tape ayout Device Area Partition Partition Area ID System Area Pack Items No. 3 and No Empty partitions Empty partition Empty partition Initiaization of partitioned tapes Housekeeping Frames Ambe Frames System Log Frames Tape Management Frames 74 Annexes Annex A - Measurement of the ight transmittance of the prisms 75 Annex B - Recognition Hoes 81 Annex C - Means to open the id 79 Annex D - Measurement of ight transmittance of tape and eaders 81 Annex E - Measurement of Signa to Noise Ratio 85 Annex F - Method for determining the nomina and the maximum aowabe recorded eves 87 Annex G - Representation of 8-bit bytes by 10-bit patterns 89 Annex H - Measurement of bit shift 97 Annex J - Recommendations for transportation 99 Annex K - Method of measuring track edge inearity 101 Annex L - Read-After-Write 107 Annex M - Exampe of the content of a Basic Group No

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13 Section 1 - Genera 1 Scope This ECMA Standard specifies the physica and magnetic characteristics of a 3,81 mm wide magnetic tape cartridge to enabe interchangeabiity of such cartridges between drives. It aso specifies the quaity of the recorded signas, the recording method and the recorded format, thereby aowing data interchange between drives by means of such magnetic tape cartridges. Information interchange between systems aso requires, at a minimum, agreement between the interchange parties upon the interchange code(s) and the specifications of the structure and abeing of the information on the interchanged cartridge. Under information interchange circumstances in which a processing agorithm, e.g. for ossess data compression as specified in ECMA-151, is appied to the host data prior to recording on the tape and a compementary reprocessing agorithm is appied after the data is read from the tape, agreement upon these by the interchange parties is aso required. 2 Conformance 2.1 Magnetic tape cartridge A tape cartridge sha be in conformance with this ECMA Standard if it meets a the mandatory requirements specified herein. The tape requirements sha be satisfied throughout the extent of the tape. For each recorded Entity any agorithm used for processing the data therein sha have been registered, and the registration identification sha be incuded, when appropriate, in Byte No. 3 of the Entity Header. A recorded tape sha be either a Singe Data Space Tape or a Partitioned Tape. 2.2 Generating drive A drive generating a magnetic tape cartridge for interchange sha be entited to caim conformance with this ECMA Standard if a recordings on the tape meet the mandatory requirements of this ECMA Standard, and if either or both methods of appending and overwriting are impemented. A caim of conformance sha state which of the foowing optiona features are impemented and which are not the performing of a Read-After-Write check and the recording of any necessary repeated frames; the recording of mutipe representations of the same Basic Group; the generation of ECC3 Frames. In addition a caim of conformance sha state whether or not one, or more, registered agorithm(s) are impemented within the system and are abe to process data received from the host prior to coecting the data into Basic Groups, and the agorithm registration identification number(s) of the impemented agorithm(s). 2.3 Receiving drive A drive receiving a magnetic tape cartridge for interchange sha be entited to caim conformance with this ECMA Standard if it is abe to hande any recording made on the tape according to this ECMA Standard. In particuar it sha be abe to recognize repeated frames and to make avaiabe to the host, data and Separator Marks from ony one of these frames; be abe to recognize mutipe representations of the same Basic Group, and to make avaiabe to the host, data and Separator Marks from ony one of these representations; be abe to recognize an ECC3 frame, and ignore it if the system is not capabe of using ECC3 check bytes in a process of error correction; be abe to update the System Log(s) if the Write-inhibit Hoe state so permits;

14 - 2 - be abe to recognize processed data within an Entity, identify the agorithm used, and make the agorithm registration number avaiabe to the host; be abe to make processed data avaiabe to the host. In addition a caim of conformance sha state whether or not the system is capabe of using ECC3 check bytes in a process of error correction; whether or not one or more reprocessing agorithm(s) are impemented within the system, and are abe to be appied to Processed Data prior to making such data avaiabe to the host; the agorithm registration number(s) of the processing agorithm(s) for which a compementary reprocessing agorithm is impemented. 3 References ISO/R 527:1966 ISO 1302:1992 ISO/IEC 11576:1994 ECMA-129 (1994) Pastics - Determination of tensie properties. Technica Drawings - Method of indicating surface texture on drawings. Information technoogy - Procedure for the registration of agorithms for the ossess compression of data. Information Technoogy Equipment - Safety 4 Definitions For the purposes of this ECMA Standard the foowing definitions appy. 4.1 Absoute Frame Number (AFN) A sequence number, encoded in the Frame. 4.2 a.c. erase A process of erasure utiising magnetic fieds of decaying intensity. 4.3 Access Point A point, at the start of a Processed Record Sequence, at which the presentation of Codewords to a reprocessing agorithm is required to start, regardess of whether the data of interest in a retrieva operation starts at that point or at a subsequent point. 4.4 agorithm A set of rues for transforming the ogica representation of data. 4.5 Area ID An identifier defining the area of the tape and specifying the types of Frame written. 4.6 Automatic Track Finding (ATF) The method by which tracking is achieved. 4.7 Average Signa Ampitude The average peak-to-peak vaue of the output signa from the read head at the fundamenta frequency of the specified physica recording density over a minimum of 7,8 mm of track, excusive of missing puses. 4.8 azimuth The anguar deviation, in degrees, minutes and seconds of arc, made by the mean fux transition ine with the ine norma to the centreine of the recorded track. 4.9 back surface The surface of the tape opposite to the magnetic coating which is used to record data byte An ordered set of bits acted upon as a unit.

15 cartridge A case containing magnetic tape stored on twin hubs Channe Bit A bit after 8-10 transformation Codeword A word which is generated by a processing agorithm. The number of bits in a Codeword is variabe, and is not defined by this Standard Data Format ID An identifier specifying which data format is being used on the tape Eary Warning Point (EWP) A point aong the ength of the tape at which warning is given of the approach, in the forward direction of tape motion, of the Partition Boundary or of the Physica End of Tape End of Data (EOD) The point on the tape at the end of the group which contains the ast user data Entity A unit of recorded data, comprising a Processed Record Sequence preceded by housekeeping information Error Correcting Code (ECC) A mathematica computation yieding check bytes used for the detection and correction of errors fux transition position That point which exhibits maximum free-space fux density norma to the tape surface fux transition spacing The distance aong a track between successive fux transitions Frame A pair of adjacent tracks with azimuths of opposite poarity, in which the track with the positive azimuth precedes that with the negative azimuth Housekeeping Frame A Frame which contains no user data and which is identified as such by the vaues in the data fieds therein Logica Beginning of Tape (LBOT) The point aong the ength of the tape where a recording of data for interchange commences magnetic tape A tape which wi accept and retain the magnetic signas intended for input, output and storage purposes on computers and associated equipment Master Standard Ampitude Caibration Tape A pre-recorded tape on which the standard signa ampitudes have been recorded in the tracks of positive azimuth, 21 µm wide, recorded at a track pitch of 27,2 µm, on an a.c. erased tape. NOTE 1 The tape incudes recordings made at 83,3 ftpmm, 333,3 ftpmm, 500 ftpmm, 1 000,0 ftpmm and 1 499,9 ftpmm. NOTE 2 The Master Standard Ampitude Caibration Tape has been estabished by Reiabiity Centre for Eectronic Components of Japan (RCJ) Master Standard Reference Tape A tape seected as the standard for Reference Recording Fied, Signa Ampitude, Resoution, Overwrite and Signato-Noise Ratio.

16 - 4 - NOTE 3 The Master Standard Reference Tape has been estabished by RCJ Optimum Recording Fied In the pot of Average Signa Ampitude against the recording fied at the physica recording density of 2 999,9 ftpmm, the fied that causes the maximum Average Signa Ampitude Partition Boundary The point aong the ength of a magnetic tape at which partition 1 ends and partition 0 commences Physica Beginning of Tape (PBOT) The point where the eader tape is joined to the magnetic tape Physica End of Tape (PEOT) The point where the traier tape is joined to the magnetic tape physica recording density The number of recorded fux transitions per unit ength of track, expressed in fux transitions per miimetre (ftpmm) pre-recording condition (see annex F) The recording eves above which a tape intended for interchange sha not previousy have been recorded processing The use of an agorithm to transform host data into Codewords processed data A sequence of Codewords which resuts from the appication of processing to data Processed Record A sequence of Codewords which resuts from the appication of processing to an Unprocessed Record Processed Record Sequence A sequence of one or more Processed Records which starts on an 8-bit boundary and ends on a subsequent 8-bit boundary record Reated data treated as a unit of information Reference Recording Fied The Optimum Recording Fied of the Master Standard Reference Tape reprocessing The use of an agorithm to transform Codewords into data as required by the host Secondary Standard Ampitude Caibration Tape A tape pre-recorded as defined for the Master Standard Ampitude Caibration Tape; the outputs are known and stated in reation to those of the Master Standard Ampitude Caibration Tape. NOTE 4 Secondary Standard Ampitude Caibration Tapes can be ordered from RCJ, Hachiman-cho, Higashikurume, Tokyo 203, Japan, under Part Number JCM 6129 unti the year It is intended that these be used for caibrating tertiary reference tapes for use in routine caibration Secondary Standard Reference Tape A tape the performance of which is known and stated in reation to that of the Master Standard Reference Tape.

17 - 5 - NOTE 5 Secondary Standard Reference Tapes can be ordered from RCJ, Hachiman-cho, Higashikurume, Toyko 203, Japan, under Part Number JRM 6129 unti the year It is intended that these be used for caibrating tertiary reference tapes for use in routine caibration Separator Mark A record containing no user data, which is used to separate data Standard Reference Ampitude The Average Signa Ampitude from the tracks of positive azimuth of the Master Standard Ampitude Caibration Tape at a specified physica recording density Tape Reference Edge The bottom edge of the tape when viewing the recording side of the tape, with the PEOT to the observer's right Test Recording Current The current that produces the Reference Recording Fied track A diagonay positioned area on the tape aong which a series of magnetic signas may be recorded unprocessed data Data which has not been subjected to processing Unprocessed Record A record of unprocessed data, comprising an integra number of bytes Virtua End of Tape (VEOT) The point aong the ength of the magnetic tape within partition 1 which defines the end of the part of partition 1 which is usabe for recording data for interchange. 5 Environment and safety Uness otherwise stated, the conditions specified beow refer to the ambient conditions of the air immediatey surrounding the cartridge. 5.1 Testing environment Uness otherwise stated tests and measurements made on the tape cartridge to check the requirements of this ECMA Standard sha be carried out under the foowing conditions: temperature : 23 C ± 2 C reative humidity : 40 % to 60 % conditioning period before testing : 24 h 5.2 Operating environment Cartridges used for data interchange sha be capabe of operating under the foowing conditions: temperature : 5 C to 45 C reative humidity : 20 % to 80 % wet bub temperature : 26 C max. There sha be no deposit of moisture on or in the cartridge. Conditioning before operating: If a cartridge has been exposed during storage and/or transportation to a condition outside the above vaues, before use the cartridge sha be conditioned in the operating environment for a time at east equa to the period during which it has been out of the operating environment, up to a maximum of 24 h.

18 - 6 - NOTE 6 Rapid variations of temperature shoud be avoided. 5.3 Storage environment For ong-term or archiva storage of cartridges the foowing conditions sha be observed: temperature : 5 C to 32 C reative humidity : 20 % to 60 % wet bub temperature : 26 C max. The stray magnetic fied at any point on the tape sha not exceed A/m. There sha be no deposit of moisture on or in the cartridge. 5.4 Transportation Recommended imits for the environment to which a cartridge may be subjected during transportation, and the precautions to be taken to minimize the possibiity of damage, are provided in annex J. 5.5 Safety The cartridge and its components sha satisfy the requirements of ECMA Fammabiity The cartridge and its components sha be made from materias, which if ignited from a match fame, do not continue to burn in a sti carbon dioxide atmosphere. Section 2 - Requirements for the case 6 Dimensiona and mechanica characteristics of the case 6.1 Genera The case of the cartridge sha comprise an upper haf, a ower haf, a sider movaby mounted on the ower haf, a id pivotay mounted on the upper haf. In the drawings, using third ange projection, an embodiment of the cartridge is shown as an exampe. Figure 1 is a perspective view of the cartridge seen from top. Figure 2 is a perspective view of the cartridge seen from bottom. Figure 3 is a partia view of the rear side. Figure 4 is a schematic view showing the Reference Panes X, Y and Z. Figure 5 shows the front side. Figure 6 shows the top side with the id in cosed position. Figure 7 shows the eft side. Figure 8 shows the top side with the id in open position. Figure 9 shows the eft side with the id in open position. Figure 10 shows the bottom side with the id and the sider in cosed position. Figure 11 shows the bottom side with the id and the sider in open position. Figure 12 is a view from the top of the inside of the ower haf with the upper haf removed. Figure 13 is a view of the bottom haf with the id and the sider in open position. Figure 14 is a view of the eft side with the id and the sider in open position. Figure 15 is a top view of a hub. Figure 16 is a side view of a hub with partia cross-section. Figure 17 is a partia cross-section through a hub and both haves of the case showing the interface with the drive spinde. Figure 18 shows at a arger scae the id in the open position.

19 - 7 - Figures 19, 20 show at a arger scae the functiona reationship between the id and the ocking mechanism of the hubs. Figures 21, 22 show the abe areas on the top and the rear side. Figure 23 shows both corners of the bottom side, for autooaders. The dimensions are referred to three orthogona Reference Panes X, Y and Z (figure 4). Pane X is perpendicuar to Pane Z and passes through the centres of both the circuar and eongated Datum Hoes, reveaed when the sider is opened (see and figure 11). Pane Y is perpendicuar to Pane X and Pane Z and passes through the centre of the circuar Datum Hoe. Pane Z is the pane on which the sider moves (see figure 7). 6.2 Overa dimensions (figures 6 and 7) The overa dimensions of the case with the id in the cosed position sha be 1 = 73,0 mm ± 0,3 mm 2 = 54,0 mm ± 0,3 mm 3 = 10,5 mm ± 0,2 mm The edges formed by the rear side and the eft and right sides sha be rounded off with a radius r 1 = 1,5 mm max. The two edges of the id sha be rounded off with a radius r 2 = 0,5 mm max. 6.3 Loading grip (figure 6) The top side sha have a oading grip for oading and positioning the cartridge into the drive. The position and dimensions of the oading grip sha be 4 = 25,5 mm ± 0,3 mm 5 = 10 mm min. 6 = 5,0 mm ± 0,2 mm 7 = 2,0 mm min. The depth of the oading grip beow the surface of the top side sha be + 0,2 mm 0,5 mm - 0,0 mm 6.4 Hoding areas (figure 6) The two areas shown shaded in figure 6 sha be the areas aong which the cartridge sha be hed down when inserted in the drive. Their positions and dimensions sha be 8 = 6,0 mm ± 0,1 mm 9 = 5,0 mm ± 0,1 mm 6.5 Notches of the id (figures 5 and 8) The id sha have two pairs of notches. The first pair of notches, the sider ock reease notches, aows eements of the drive to reease the ocking mechanism of the sider. The positions and dimensions of these notches sha be 10 = 0,4 mm max. 11 = 3,0 mm min. 12 = 1,2 mm ± 0,1 mm 13 = 49,8 mm ± 0,2 mm

20 - 8 - The second pair of notches, the sider movement notches, aows eements of the drive to move the sider from the cosed to the open position (see aso 6.8.1). The positions and dimensions of these notches sha be 11 = 3,0 mm min. 14 = 0,9 mm min. 15 = 7,5 mm ± 0,1 mm 16 = 36,00 mm ± 0,15 mm 6.6 Lid dimensions (figures 6 to 8) The id is shown in the cosed position in figures 6 and 7. Its dimensions sha be 17 = 1,2 mm ± 0,1 mm 18 = 6,8 mm ± 0,4 mm 19 = 1,1 mm ± 0,1 mm 20 = 2,0 mm ± 0,1 mm 21 = 6,4 mm ± 0,2 mm 22 = 1,5 mm ± 0,1 mm r 3 = 6,8 mm ± 0,4 mm The id sha have a chamfer of 45 by 23 = 1,5 mm ± 0,1 mm There sha be a dimensiona reationship between the height 24 shown in figure 7, which incudes the sider and the upper haf, and the height 25 of the id. When a vertica force of 1 N is exerted on the upper haf the foowing condition sha be met. 24 = 10,5 mm ± 0,2 mm When no force is exerted 24 = 10,9 mm max. In figure 8 the id is shown in the open position. The distance from the front edge of the id to the rear side sha be 26 = 55,5 mm ± 0,3 mm. 6.7 Optica detection of the beginning and end of tape (figures 9 and 12) Means for the optica detection of the beginning and end of tape sha be provided. These sha consist of a pair of windows on the eft and right sides of the case (see aso figure 18). The design of these windows aows this detection for two different drive designs: either a ight source and a detector are provided in the drive on each side of the cartridge, in which case the ight enters the case through the upper windows, fas on a prism (see section A-A) mounted inside the case, which refects this ight so that it goes through the tape and fas on the detector through the ower window; the ight transmittance of the prism sha be greater than 50% of that of a reference prism when measured as specified in annex A, or, the ight of a ight source within the drive passes through the tape from inside the cartridge and fas through the ower windows onto the detectors paced on each side of the case. The positions and dimensions of these windows aow the cartridge to be used with drives impementing either system, they sha be 27 = 6,20 mm ± 0,10 mm 28 = 7,65 mm ± 0,10 mm

21 ,20 mm 29 = 1,50 mm - 0,00 mm 30 = 3,9 mm ± 0,1 mm 31 = 1,8 mm ± 0,1 mm 32 = 7,0 mm ± 0,2 mm 33 = 2,5 mm min. Dimension 32 specifies the position of the rear edge of the windows reative to Reference Pane X. Dimension 33 sha be measured reative to this rear edge. 6.8 Bottom side The bottom side is shown in figure 10 with the id and the sider in the cosed position and in figure 11 with both in the open position. The dimension 34 of the bottom haf, 35 of the sider and 36 of the id sha satisfy the foowing conditions 34 = 73,0 mm ± 0,3 mm Locking mechanism of the sider (figure 10) The cartridge sha have a ocking mechanism for the sider which ocks it in the cosed and open positions. The design of this mechanism is not specified by this ECMA Standard, except for the different forces acting on the sider, and for its detent. The sider sha be spring-oaded by a spring hoding it in the cosed position when it is unocked. The force required to operate the sider sha not exceed 2 N. The sider sha have two grooves with an opening at each end. The detent of the ocking mechanism sha protrude through these openings so as to hod the sider in both open and cosed positions. The detent shown in cross-section C-C is ony an exampe of impementation. The grooves are parae to Reference Pane Z and aigned with the sider ock reease notches of the id. The positions and dimensions of the grooves and of the openings for the detent of the ocking mechanism when the sider is in the cosed position sha be 37 = 1,2 mm ± 0,1 mm 38 = 49,8 mm ± 0,2 mm 39 = 10,0 mm ± 0,1 mm + 0,5 mm 40 = 2,0 mm - 0,0 mm 41 = 3,0 mm min. 42 = 1,5 mm min. 43 = 0,8 mm ± 0,1 mm + 0,5 mm 44 = 0,8 mm - 0,1 mm λ = 45 min. 45 = 0,65 mm ± 0,05 mm The position and dimensions of the openings for the detent when the sider is hed in the open position are determined by 39, 40, 43 and 44.

22 In the cosed position of the sider, the maximum force to be exerted on the detent in a direction perpendicuar to Reference Pane Z and over a stroke of 0,65 mm sha be 0,5 N max. In the open position of the sider the hoding force sha be 0,3 N min Access hoes (figure 10) The sider sha have two circuar access hoes (see section B-B) which, in the open position of the sider, aow penetration of the drive spindes into the hubs. The diameters of these access hoes sha be d 1 = 10,0 mm ± 0,2 mm d 2 = 12,0 mm max Recognition, sub-datums, and write-inhibit hoes (figure 11) The bottom haf sha have a number of hoes on an edge at its rear. This edge sha be defined by 46 = 45,2 mm ± 0,2 mm 47 = 49,2 mm ± 0,2 mm The centres of these hoes ie on a ine perpendicuar to Reference Pane Y at a distance from Reference Pane X of 48 = 47,2 mm ± 0,2 mm Recognition Hoes (figures 10 and 11) There sha be four Recognition Hoes numbered from 1 to 4 as shown in figure 10. Their positions and dimensions sha be d 3 = 2,5 mm ± 0,1 mm 49 = 1,0 mm ± 0,1 mm 50 = 56,0 mm ± 0,3 mm 51 = 4,0 mm ± 0,1 mm 52 = 1,0 mm ± 0,1 mm 53 = 3,0 mm min. A Recognition Hoes sha have the cross-section shown in cross-section F-F in figure 11 for Recognition Hoe No. 1. One of the two cross-sections F-F shows a Recognition Hoe cosed by means of a pug, the other shows it with the pug punched out. These pugs sha withstand an appied force of 0,5 N max. without being punched out. Recognition Hoe No. 1 sha be open. Recognition Hoes No. 2, No. 3 and No. 4 sha be cosed. Other combinations of the states of the Recognition Hoes No. 1, No. 2, No. 3 and No. 4 are reserved for other appications (see annex B) Write-inhibit Hoe (figure 11) The position and dimensions of the Write-inhibit Hoe sha be d 4 = 2,5 mm ± 0,1 mm 50 = 56,0 mm ± 0,3 mm When the Write-inhibit Hoe is open recording on the tape is inhibited, when it is cosed recording is enabed. The Write-inhibit Hoe sha have the cross-section shown in cross-section F-F in figure 11 for Recognition Hoe No. 1. One of the two cross-sections F-F shows the hoe cosed by means of a pug, the other shows it with the hoe punched out. These pugs sha withstand an appied force of 0,5 N max without being punched out. The case may have a movabe eement aowing the Write-inhibit Hoe to be opened and cosed. If present, this eement sha be such that the state of Write-inhibit Hoe is visibe (see figure 3 as an exampe). Such an eement sha be neither broken nor moved by a force smaer than 0,5 N.

23 Regardess of whether a pug or a movabe eement is used to seect the open and cosed states of the Writeinhibit Hoe, the foowing dimensions from cross-section F-F sha define the cosed and open states, respectivey. 52 = 1,0 mm ± 0,1 mm 53 = 3,0 mm min Sub-datum hoes (figure 11) These hoes are used to position the cartridge in the drive. Their position and dimensions sha be as foows. The hoe seen beow the Write-inhibit Hoe in figure 11 sha have an eongated form and the same crosssection E-E as shown for the other hoe. 54 = 45,5 mm ± 0,2 mm 55 = 3,5 mm + 0,1 mm - 0,0 mm + 0,05 mm 56 = 2,50 mm - 0,00 mm The position and dimensions of the other Sub-datum Hoe sha be + 0,05 mm d 5 = 2,50 mm - 0,00 mm d 6 = 1,0 mm min. 57 = 5,5 mm ± 0,1 mm 58 = 2,0 mm min. 59 = 1,2 mm min. The edge of both Sub-datum Hoes sha have a chamfer of 0,2 mm ± 0,1 mm Datum hoes (figure 11) The ower haf has two Datum Hoes aso used to position the cartridge within the drive. One of them has an eongated form, the other is circuar. Cross-section D-D shown for the atter aso appies to the former. Their positions and dimensions sha be 60 = 51,0 mm ± 0,1 mm + 0,05 mm 61 = 2,80 mm - 0,00 mm + 0,1 mm 62 = 3,5 mm - 0,0 mm 63 = 3,0 mm min. + 0,05 mm d 7 = 2,80 mm - 0,00 mm The upper edge of both Datum Hoes sha have a chamfer of 0,2 mm ± 0,1 mm Access room for tape guides (figure 11) When the cartridge is inserted into the drive, tape guides in the drive pu out the tape toward the heads of the drive. The shape and dimensions of the access room provided by the cartridge for these tape guides sha be (see aso ): 64 = 3,1 mm max.

24 = 5,6 mm min. 66 = 11,0 mm max. + 0,7 mm 67 = 7,0 mm - 0,0 mm 68 = 6,7 mm min. α = 45 ± 1 69 = 47,9 mm min. + 0,00 mm 70 = 3,30 mm - 0,15 mm Hoes for accessing the hubs (figure 11) The ower haf has two hoes through which the spindes of the drive can access the hubs when the sider is in the open position. The positions and dimensions of these hoes sha be d 8 = 9,0 mm ± 0,1 mm 71 = 29,00 mm ± 0,15 mm 72 = 10,5 mm ± 0,1 mm 73 = 30,0 mm ± 0,1 mm Interna structure of the ower haf (figure 12) In figure 12 the different eements of the inside of the ower haf are shown. There sha be a ocking mechanism for the hubs to prevent them from rotating when the id is in the cosed position. The design of this ocking mechanism is not specified by this ECMA Standard, thus it is not shown in figure 12. Locking and unocking of the hubs sha depend upon the position of the id as specified in Diameter of the wound tape The diameter of the tape wound on a hub sha be d 9 = 36,5 mm max Tape wind The magnetic surface of the tape sha face outwards Tape motion The forward direction of tape motion is from the eft side of the cartridge to its right side (see figures 1 and 2) Guide posts The tape sha pass around two guide posts in the cartridge, the axes of which are perpendicuar to Reference Pane Z and pass through the centres of the Datum Hoes. The positions and dimensions of these guide posts sha be their positions are determined by those of the centres of the Datum Hoes, their cross-section sha be circuar with a radius r 4 = 3,0 mm ± 0,1 mm over an ange of 180 in cockwise sense starting at ange ρ = 45 ± 1 their cross-section over the other haf of 180 is not specified by this ECMA Standard Position of the tape in the case (view A) When the tape runs from one guide post to the other it sha remain between two panes parae to Reference Pane Z. The distance of these panes from Reference Pane Z sha be 74 = 1,4 mm min.

25 = 6,4 mm max. The design centre for the position of the tape centreine is 76 = 3,9 mm The height of the access room specified in for the tape guides sha be + 0,6 mm 77 = 8,0 mm - 0,0 mm Tape path zone When the cartridge is inserted into the drive, the tape is pued outside the case by tape guides as mentioned above. It is then no onger in contact with the guide posts. The tape path zone of the case is the zone in which the tape must be abe to move freey. This zone is defined by 78 = 5,5 mm ± 0,1 mm 79 = 56,5 mm ± 0,3 mm 80 = 8,0 mm ± 0,2 mm Light path (figure 12) As specified in 6.7 there is a ower window in the right and eft sides of the case through which ight having passed through the tape can pass and fa onto a detector of the drive. In order to ensure that the corresponding ight path is not obstructed by inner eements of the case, its configuration in this zone sha be as foows. The position and dimensions of the ower window are specified by 30 and 31 (see figure 9). The dimensions 81 = 1,5 mm max. 82 = 5,0 mm min. ensure that no eements of the case obstruct the ight path Support Areas (figure 13) When the cartridge is inserted into the drive and hed in position by forces perpendicuar to Reference Pane Z acting on the Hoding Areas (see 6.4), it sha be supported by three Support Areas A', B', C' on its bottom side, shown shaded in figure 13. The position and dimensions of these areas sha be as foows. Areas A' and B' are not specified by this ECMA Standard because they depend on parts of the ower haf for which this Standard does not specify requirements. Area C' sha be defined by 83 = 1,0 mm ± 0,1 mm 84 = 49,0 mm ± 0,3 mm Datum Areas (figure 13) There sha be two annuar Datum Surfaces A and B and one circuar such surface C. A three Datum Areas sha ie in Reference Pane Z. Their position and dimensions sha be Datum Area A sha be centred on the intersection of Reference Panes X, Y and Z, its inner diameter sha be d 7 (see and figure 11), its outer diameter sha be d 10 = 5,0 mm ± 0,1 mm Datum Area B sha be centred on the intersection of Reference Panes X and Z at a distance 60 (see and figure 11) from the centre of Datum Area A. Its inner dimensions sha be 61 and 62, its outer diameter sha be d 10. Datum Area C sha be centred on a point defined by 85 = 42,0 mm ± 0,3 mm

26 = 25,5 mm ± 0,3 mm Its diameter sha be d Reationship between Support and Datum Areas and Reference Pane Z (figure 14) Support Area A' sha be copanar with Datum Area A within 0,1 mm. Support Area B' sha be copanar with Datum Area B within 0,1 mm. Support Area C' sha be parae to Reference Pane Z within 0,1 mm. It sha be at a distance 87 = 1,10 mm ± 0,05 mm from Reference Pane Z. 6.9 Hubs (figures 15 and 16) The dimensions of the hubs sha be + 0,08 mm d 11 = 6,60 mm - 0,00 mm + 0,0 mm d 12 = 8,8 mm - 0,1 mm d 13 = 15,00 mm ± 0,05 mm β = 60 ± 1 γ = 45 ± 1 + 0,1 mm 88 = 2,5 mm - 0,0 mm + 0,20 mm 89 = 2,60 mm - 0,00 mm The two cyindrica surfaces with diameters d 11 and d 13 sha be co-axia within 0,05 mm. The torque necessary to rotate the hub with a partiay or fuy wound tape sha be 0,000 2 N m max Attachment of eader and traier tapes The method of attachment of the eader and traier tapes to the hubs sha be such that when subjected to a force of 5 N max. they wi not be detached from the hubs Interface between the hubs and the drive spindes (figure 17) The interface between the hubs and the spindes, shown in figure 17 in cross-section, is specified in terms of the foowing reationships: 1,2 mm max. d 15 - d 14 = 1,0 mm min = 1,3 mm max. NOTE 7 It is expected that the top of the drive spinde wi not penetrate within the hub beyond a distance d = 7,65 mm max. above Reference Pane Z Opening of the id (figure 18) When the id is opened its ower front edge moves aong an arc of a circe with radius r 5 = 9,6 mm ± 0,2 mm The centre of rotation is defined by 17 and 21. The end position of the id, i.e. when it is fuy open, is defined by 92 = 10,9 mm ± 0,2 mm

27 = 0,3 mm ± 0,1 mm 94 = 6,3 mm ± 0,2 mm The force F required to open the id sha not exceed 1,2 N. It sha be appied at a distance 95 = 5,0 mm ± 0,1 mm measured parae to Reference Pane Z from the centre of rotation of radius r 5 (see aso annex C) Reease of the hub ocking mechanism (figures 19 and 20) As mentioned in the design of the ocking mechanism for the hubs is not specified by this ECMA Standard, except that it sha be connected to the id so that the hubs are ocked or unocked as a function of the anguar position of the id. When the id rotates from the cosed to the open position (cockwise as seen in figures 19 and 20) the hubs sha remain ocked as ong as the id has not reached the position defined by: 96 = 7,0 mm 97 = 7,5 mm ± 0,2 mm as shown in figure 19. The hubs sha be competey reeased as soon as the id has reached the position defined by: 98 = 10,3 mm 99 = 6,6 mm ± 0,2 mm as shown in figure Labe areas (figures 21 and 22) On the top and rear sides of the case there sha be an area on which adhesive abes can be paced. The dimensions of these areas sha be 100 = 28,9 mm max. 101 = 5,2 mm min. 102 = 43,4 mm max. 103 = 39,4 mm max. 104 = 8,8 mm max. r 6 = 0,5 mm min Requirement for autooaders (figure 23) To aow use with autooaders, the channe from the Z Datum to the 87 dimension sha be cear. Within this channe, the dimensions of the corners and edges shown in figure 23 sha be 87 = 1,10 mm ± 0,05 mm r 7 = 0,3 mm max. or 0,3 mm max. chamfer δ = 6 max.

28 Rear Side Top Side Loading grip Left Side Upper haf Lower haf Right Side Sider Bottom Side Front Side Lid ECMA A Figure 1 - Top view Recognition Hoe No 4 Write-inhibit Hoe Sub-datum Hoe Rear Side Sub-datum Hoe Recognition Hoes No 1 to 3 Bottom Side Right Side Top Side Left Side Front Side ECMA A Figure 2 - Bottom view

29 Right Side Write-inhibit Indicator ECMA A Rear Side Figure 3 - Partia view of the rear side Y Z X ECMA A Figure 4 - Reference Panes X, Y, Z

30 L 10 r 2 L 8 L 2 r 1 L 9 L 11 L 11 L 1 L 13 L 16 L 11 L 14 L 4 L 6 L 5 L 7 Y L 16 L 11 L 12 Figure 5 - Front Side, id cosed ECMA A Z r 2 L 17 L L 8 18 Figure 6 - Top Side, id cosed ECMA A L r 1 9 L 20 L 19 r 3 L 25 L 21 L 24 L 3 L L Z ECMA A Figure 7 - Left Side, id cosed X

31 Y Prism A A 26 X Figure 8 - Top side, id open Z Z 29 Section A-A Figure 9 - Left Side, id open ECMA A

32 (4) 40 C 41 C B B d B B C C 37 (3) (2) (1) Y 39 X d Z Section B-B d 2 43 λ 44 Section C-C 45 ECMA A Figure 10 - Bottom side, id cosed

33 d 3 d 5 56 d 4 d 8 71 α X E E 66 D D 64 Y 51 F F d d 6 Section D-D Section E-E Section F-F Section F-F (Punch out) ECMA A Figure 11 - Bottom side, id open

34 X G Tape path zone r 4 FWD A 79 ρ G Take up Suppy Y ρ d 9 78 FWD r 4 Tape path zone 80 Light path (direct) Light path (prism) Z Z View A Section G-G Tape ECMA A Figure 12 - Inside view of the ower haf

35 B' d 10 B 84 C' C 86 d 10 A Y 83 d A' X ECMA A Figure 13 - Bottom side, id and sider in open position Z 87 ECMA A Figure 14 - Left side, id open

36 d 11 d 12 B * View B β 89 ECMA A Figure 15 - Top view of a hub d γ ECMA A Figure 16 - Side view of a hub Ree Spinde d 91 Z d 14 ECMA A d 15 Figure 17 - Interface with the drive spinde

37 F r Z 95 X ECMA A Figure 18 - Lid in competey open position Z X ECMA A Z X ECMA A Figure 19 - Extreme position of Figure 20 - Minimum position of the the id for which the id for which the hubs hubs are sti ocked are competey unocked

38 Figure 21 - Top side, abe area 104 ECMA A r r 6 6 Figure 22 - Rear side, abe area

39 A B Z 8 7 r 7 r 7 δ Detai A r 7 Detai B B ECMA A Figure 23 - Bottom side, both corners Section 3 - Requirements for the unrecorded tape 7 Mechanica, physica and dimensiona characteristics of the tape 7.1 Materias The recordabe area of the tape sha consist of a base materia (aromatic poyamide or equivaent) coated on one side with a strong yet fexibe ayer of ferromagnetic materia. The back surface may be coated.

40 There sha be a eader tape between the take-up hub and PBOT. There sha be a traier tape between PEOT and the suppy hub. The eader and traier tapes sha consist of a transucent ength of the same or equivaent base materia without the ferromagnetic coating or the back coating. The eader and traier tapes sha each be attached to the magnetic tape by means of a ength of spicing tape which extends over each such joint. The spicing tape sha consist of poyethyene terephthaate (or equivaent), coated on one side with an acryic (or equivaent) adhesive materia. 7.2 Tape ength Length of magnetic tape The ength of tape between PBOT and PEOT sha be not ess than 10 m and not greater than 125 m Length of eader and traier tapes The ength of the eader and traier tapes sha be 60 mm ± 5 mm. The joints between the eader and traier tapes and the magnetic tape sha be perpendicuar to the Tape Reference Edge within Length of spicing tapes The spicing tapes sha extend for a distance of not ess than 6,0 mm and not more than 7,0 mm over the eader and traier tapes. Their extents over the magnetic tape sha be not ess than 4,0 mm and not more than 10,0 mm. 7.3 Tape width Width of magnetic, eader and traier tapes The width of the magnetic tape and of the eader and traier tapes sha be + 0,00 mm 3,81 mm - 0,02 mm The width sha be measured across the tape from edge to edge when the tape is under a tension of 0,18 N max Width and position of spicing tape The width of the spicing tape and its position across the width of the eader, traier and magnetic tapes sha be such that the bottom edge of the spicing tape sha be no more than 0,60 mm from the bottom edges of the other tapes and the top edge of the spicing tape sha be no more than 0,60 mm from their top edges. Neither edge of the spicing tape sha extend beyond the edges of the eader, traier and magnetic tapes. 7.4 Discontinuities Between PBOT and PEOT there sha be no discontinuities in the magnetic tape such as those produced by tape spicing or perforations. 7.5 Tape thickness Thickness of magnetic tape The thickness of the magnetic tape at any point sha be + 0,0 µm 6,9 µm 0,8 µm Thickness of eader and traier tape The thickness of the eader and traier tapes at any point sha be between 11 µm and 17 µm Thickness of spicing tape The thickness of the spicing tape at any point sha be 27 µm max. 7.6 Longitudina curvature The radius of curvature of the edge of the tape sha not be ess than 33 m. Procedure: Aow a 1 m ength of tape to unro and assume its natura curvature on a fat smooth surface. Measure the deviation from a 1 m chord. The deviation sha not be greater than 3,8 mm. This deviation corresponds to the minimum radius of curvature of 33 m if measured over an arc of a circe.

41 Cupping The departure across the width of tape from a fat surface sha not exceed 0,5 mm. Procedure: Cut a 1,0 m ± 0,1 m ength of tape. Condition it for a minimum of 3 h in the test environment by hanging it so that both surfaces are freey exposed to the test environment. From the centre portion of the conditioned tape cut a test piece of 25 mm ength. Stand the test piece on its end in a cyinder which is at east 25 mm high with an inside diameter of 4,1 mm ± 0,2 mm. With the cyinder standing on an optica comparator measure the cupping by aigning the edges of the test piece to the retice and determining the distance from the aigned edges to the corresponding surface of the test piece at its centre. 7.8 Coating adhesion The force required to pee any part of the coating from the tape base materia sha not be ess than 0,05 N. Procedure (see figure 24): Take a test piece of the tape approximatey 380 mm ong and scribe a ine through the recording coating across the width of the tape 125 mm from one end. Using a doube-sided pressure sensitive tape, attach the fu width of the test piece to a smooth meta pate, with the recording surface facing the pate, as shown in the figure beow. Fod the test piece over 180, attach the meta pate and the free end of the test piece to the jaws of a universa testing machine and set the speed of the jaw separation to 254 mm per min. Note the force at which any part of the coating first separates from the base materia. If this is ess than 0,05 N, the tape has faied the test. If the test piece pees away from the doube-sided pressure sensitive tape before the force exceeds 0,05 N, an aternative type of doubesided pressure sensitive tape sha be used. If the back surface of the tape is coated, repeat the procedure for the back coating. Recording surface Scribed ine 125 mm Pressure-sensitive tape ECMA A Figure 24 - Setup for measuring coating adhesion 7.9 Layer-to-ayer adhesion There sha be no tendency for the test piece to stick or for the coating to pee. Procedure: Attach one end of a test piece of magnetic tape of ength 1 m to the surface of a gass tube of diameter 36 mm. Wind the tape on to the tube at a tension of 1,1 N. Store the wound test piece in a temperature of 45 C ± 3 C and a reative humidity of 80 % for 4 h. Store for a further 24 h in the Testing Environment. Appy a force of 0,1 N to the free end of the test piece and aow it to unwind sowy.