Information technology — 8 mm wide magnetic tape cartridge — Helical scan recording — AIT-1 format

Technologies de l'information — Cartouche de bande magnétique de 8 mm de large — Enregistrement par balayage en spirale — Format AIT-1

General Information

Status
Published
Publication Date
22-Jul-1998
Current Stage
9093 - International Standard confirmed
Start Date
20-Nov-2003
Completion Date
21-Aug-2020
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ISO/IEC 15780:1998 - Information technology -- 8 mm wide magnetic tape cartridge -- Helical scan recording -- AIT-1 format
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INTERNATIONAL ISO/IEC
STANDARD 15780
First edition
1998-08-01
Information technology — 8 mm wide
magnetic tape cartridge — Helical scan
recording — AIT-1 format
Technologies de l’information — Cartouche de bande magnétique de 8 mm
de large — Enregistrement par balayage en spirale — Format AIT-1
Reference number
B C
ISO/IEC 15780:1998(E)
---------------------- Page: 1 ----------------------
ISO/IEC 15780:1998(E)
Contents
Section 1 - General 1
1 Scope 1
2 Conformance
2.1 Magnetic tape cartridge 1
2.2 Generating drive 1
2.3 Receiving drive 1
3 Normative references 2
4 Definitions 2
4.1 Absolute Frame Number (AFN) 2
4.2 a.c. erase 2
4.3 Access 2
4.4 algorithm 2
4.5 Area ID 2
4.6 Automatic Track Finding (ATF) 2
4.7 Average Signal Amplitude 2
4.8 azimuth 2
4.9 back surface 2
4.10 byte 2
4.11 cartridge 2
4.12 Channel bit 2
4.13 Codeword 2
4.14 Early Warning Point (EWP) 2
4.15 End of Data (EOD) 2
4.16 Entity 2
4.17 Error Correcting Code (ECC) 2
4.18 flux transition position 2
4.19 flux transition spacing 2
4.20 Frame 2
4.21 Housekeeping Frame 3
4.22 Logical Beginning of Tape (LBOT) 3
4.23 magnetic tape 3
4.24 Master Standard Amplitude Calibration Tape 3
4.25 Master Standard Reference Tape 3
4.26 Memory In Cartridge (MIC) 3
4.27 Partition Boundary 3
4.28 Physical Beginning of Tape (PBOT) 3
4.29 Physical End of Tape (PEOT) 3
4.30 physical recording density 3
© ISO/IEC 1998

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or

utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm,

without permission in writing from the publisher.
ISO/IEC Copyright Office • Case postale 56 • CH-1211 Genève 20 • Switzerland
Printed in Switzerland
---------------------- Page: 2 ----------------------
ISO/IEC ISO/IEC 15780:1998 (E)
4.31 pre-recording condition 3
4.32 processing 3
4.33 processed data 3
4.34 Processed Record 3
4.35 record 3
4.36 Reference Field 3
4.37 reprocessing 3
4.38 Secondary Standard Amplitude Calibration Tape 3
4.39 Secondary Standard Reference Tape 3
4.40 Separator Mark 3
4.41 Standard Reference Amplitude (SRA) 3
4.42 Tape Reference Edge 4
4.43 Typical Field 4
4.44 Standard Reference Current 4
4.45 Test Recording Current 4
4.46 track 4
4.47 unprocessed data 4
4.48 Unprocessed Record 4
5 Conventions and Notations 4
5.1 Representation of numbers 4
5.2 Names 4
6 Acronyms 4
7 Environment and safety 5
7.1 Test environment 5
7.2 Operating environment 5
7.3 Storage environment 5
7.4 Transportation 5
7.5 Safety 5
7.6 Flammability 5
8 Dimensional and mechanical characteristics of the case 6
8.1 General 6
8.2 Overall dimension 6
8.3 Holding areas 7
8.4 Cartridge insertion 7
8.5 Window 8
8.6 Loading grips 8
8.7 Label areas 8
8.8 Datum areas and Datum holes 8
8.9 Support areas 9
8.10 Recognition holes 10
8.11 Write-inhibit hole 10
8.12 Pre-positioning surfaces 11
8.13 Cartridge lid 11
8.14 Cartridge reel lock 12
8.15 Reel access holes 13
8.16 Interface between the reels and the drive spindles 13
8.17 Light path 14
8.18 Position of the tape in the case 15
8.19 Tape path zone 15
8.20 Tape access cavity 15
8.21 Tape access cavity clearance requirements 16
8.22 Requirements for the MIC 16
8.22.1 Access holes 16
iii
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ISO/IEC 15780:1998 (E) ISO/IEC
8.22.2 Recognition recesses 17
Section 3 - Requirements for the unrecorded tape 37
9 Mechanical, physical and dimensional characteristics of the tape 37
9.1 Materials 37
9.2 Tape length 37
9.2.1 Length of magnetic tape 37
9.2.2 Length of leader and trailer tapes 37
9.2.3 Length of the splicing tapes 37
9.3 Tape width 37
9.3.1 Width of magnetic, leader and trailer tapes 37
9.3.2 Width and position of the splicing tape 37
9.4 Discontinuities 37
9.5 Tape thickness 38
9.5.1 Thickness of the magnetic tape 38
9.5.2 Thickness of leader and trailer tape 38
9.5.3 Thickness of splicing tape 38
9.6 Longitudinal curvature 38
9.7 Cupping 38
9.8 Coating adhesion 38
9.9 Layer-to-layer adhesion 39
9.10 Tensile strength 39
9.10.1 Breaking strength 39
9.10.2 Yield strength 39
9.11 Residual elongation 39
9.12 Electrical resistance of the recording surface 40
9.13 Tape winding 40
9.14 Light transmittance of the tape 40
10 Magnetic recording characteristics 40
10.1 Typical Field 41
10.2 Signal Amplitude 41
10.3 Resolution 41
10.4 Overwrite 41
10.5 Ease of erasure 42
10.6 Tape quality 42
10.6.1 Missing pulses 42
10.6.2 Missing pulse zone 42
10.7 Signal-to-Noise Ratio (SNR) characteristic 42
Section 4 - Requirements for an interchanged tape 42
11 Format 42
11.1 General 42
11.2 Basic Groups 43
11.2.1 Entity 43
11.2.2 Group Information Table 44
11.2.3 Block Access Table (BAT) 46
11.3 Sub-Groups 49
11.3.1 G1 Sub-Group 49
11.3.2 G2 Sub-Group - Randomizing 50
11.3.3 G3 Sub-Group 51
11.4 Data Block 52
11.4.1 ID information 53
11.4.2 Recording of the ID Information in the Data Block Headers 55
12 Method of recording 58
12.1 Physical recording density 58
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ISO/IEC ISO/IEC 15780:1998 (E)
12.2 Long-term average bit cell length 58
12.3 Short-term average bit cell length 58
12.4 Rate of change 58
12.5 Bit shift 58
12.6 Read signal amplitude 58
12.7 Maximum recorded levels 58
13 Track geometry 59
13.1 Track configuration 59
13.2 Average track pitch 59
13.3 Variations of the track pitch 59
13.4 Track width 59
13.5 Track angle 60
13.6 Track edge straightness 60
13.7 Track length 60
13.8 Azimuth angles 60
14 Recorded patterns 60
14.1 Recorded Data Block 60
14.2 Margin blocks 60
15 Format of a track 60
15.1 Track capacity 60
15.2 Positioning accuracy 61
15.3 Tracking scheme 62
16 Layout of a Single Data Space tape 62
16.1 Device Area 63
16.2 Reference Area 63
16.3 Position Tolerance Band No. 1 63
16.4 System Area 63
16.4.1 System Preamble 64
16.4.2 System Log 64
16.4.3 System Postamble 67
16.4.4 Position Tolerance Band No. 2 67
16.4.5 Vendor Group Preamble 67
16.5 Data Area 67
16.5.1 Vendor Group 67
16.5.2 Recorded Data Group 67
16.5.3 ECC3 67
16.5.4 Multiple Recorded Instances 68
16.5.5 Repeated Frames 68
16.5.6 Appending and overwriting 69
16.6 EOD Area 70
16.7 Optional Device Area 70
16.8 Early Warning Point - EWP 71
16.9 Initialization 71
17 Layout of partitioned tape 72
17.1 Overall magnetic tape layout 72
17.1.1 Partition 72
17.2 LBOT 73
17.3 Empty Partition 73
17.4 Initialization of partitioned tapes 73
18 Housekeeping Frames 73
18.1 Amble Frames 73
18.2 System Amble Frames 74
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ISO/IEC 15780:1998 (E) ISO/IEC
Annexes
A - Measurement of light transmittance 75
B - Measurement of Signal-to-Noise Ratio 78

C - Method for determining the nominal and the maximum allowable recorded levels 79

D - Representation of 8-bit bytes by 10-bit patterns 80
E - Measurement of bit shift 92
F - Method of measuring the straightness of track edges 94
G - ECC calculation 95
H - Recommendations for transportation 98
J - Read-After-Write 99
K - Example of the content of a Basic Group No. 0 100
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ISO/IEC ISO/IEC 15780:1998 (E)
Foreword

ISO (the International Organization for Standardization) and IEC (the International Electrotechnical Commission) form the

specialized system for worldwide standardization. National bodies that are members of ISO or IEC participate in the

development of International Standards through technical committees established by the respective organization to deal with

particular fields of technical activity. ISO and IEC technical committees collaborate in fields of mutual interest. Other

international organizations, governmental and non-governmental, in liaison with ISO and IEC, also take part in the work.

In the field of information technology, ISO and IEC have established a joint technical committee, ISO/IEC JTC 1. Draft

International Standards adopted by the joint technical committee are circulated to national bodies for voting. Publication as an

International Standard requires approval by at least 75 % of the national bodies casting a vote.

This International Standard was prepared by ECMA (as ECMA-246) and was adopted, under a special “fast-track procedure”,

by Joint Technical Committee ISO/IEC JTC 1, Information technology, in parallel with its approval of national bodies of ISO

and IEC.

Annexes A to G form an integral part of this International Standard. Annexes H to K are for information only.

vii
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INTERNATIONAL STANDARD ©ISO/IEC ISO/IEC 15780:1998(E)
Information technology — 8 mm wide magnetic tape cartridge — Helical scan
recording — AIT-1 format
Section 1 - General
1 Scope

This International Standard specifies the physical and magnetic characteristics of an 8 mm wide magnetic tape cartridge to

enable physical interchange of such cartridges between drives. It also specifies the quality of the recorded signals, the

recording method and the recorded format - called Advanced Intelligent Tape No. 1 (AIT-1) - thereby allowing data

interchange between drives by means of such magnetic tape cartridges.

Information interchange between systems also requires, at a minimum, agreement between the interchange parties upon the

interchange code(s) and the specifications of the structure and labelling of the information on the interchanged cartridge.

2 Conformance
2.1 Magnetic tape cartridge

A tape cartridge shall be in conformance with this International Standard if it meets all the mandatory requirements specified

herein. The tape requirements shall be satisfied throughout the extent of the tape.

2.2 Generating drive

A drive generating a magnetic tape cartridge for interchange shall be in conformance with this International Standard if all

recordings on the tape meet the mandatory requirements of this International Standard, and if either or both methods of

appending and overwriting are implemented.

A claim of conformance shall state which of the following optional features are implemented and which are not

− the performing of a Read-After-Write check and the recording of any necessary repeated frames;

− the generation of ECC3 Frames.
In addition a claim of conformance shall state

− whether or not one, or more, registered algorithm(s) are implemented within the system and are able to compress data

received from the host prior to collecting the data into Basic Groups, and

− the registered identification number(s) of the implemented compression algorithm(s).

2.3 Receiving drive

A drive receiving a magnetic tape cartridge for interchange shall be in conformance with this International Standard if it is able

to handle any recording made on the tape according to this International Standard. In particular it shall

− be able to recognise repeated frames, and to make available to the host, data and Separator Marks from only one of these

frames;

− be able to recognise multiple representations of the same Basic Group, and to make available to the host, data and

Separator Marks from only one of these representations;

be able to recognise an ECC3 frame, and ignore it if the system is not capable of using ECC3 check bytes in a process of

error correction;

− be able to recognise processed data within an Entity, identify the algorithm used, and make its registered identification

number available to the host;
− be able to make processed data available to the host.
In addition a claim of conformance shall state

− whether or not the system is capable of using ECC3 check bytes in a process of error correction;

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ISO/IEC 15780:1998 (E) ISO/IEC

− whether or not one or more de-compression algorithm(s) are implemented within the system, and are able to be applied to

compressed data prior to making such data available to the host;

− the registered identification number(s) of the compression algorithm(s) for which a complementary de-compression

algorithm is implemented.
3 Normative references

The following standards contain provisions which, through reference in this text, constitute provisions of this International

Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to

agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent

editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International

Standards.
ISO/R 527 (all parts), Plastics - Determination of tensile properties.
ISO 1302:1992, Technical drawings - Method of indicating surface texture.

ISO/IEC 11576:1994, Information technology - Procedure for the registration of algorithms for the lossless compression

of data.
4 Definitions
For the purposes of this International Standard the following definitions apply.
4.1 Absolute Frame Number (AFN): A sequence number, encoded in the Frame.

4.2 a.c. erase: A process of erasure utilizing magnetic fields of decaying intensity.

4.3 Access:
A read or write pass over a partition.

4.4 algorithm: A set of rules for transforming the logical 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 Signal Amplitude: The average peak-to-peak value of the output signal from the read head at the

fundamental frequency of the specified physical recording density over a minimum of 20,0 mm of track, exclusive of

missing pulses.

4.8 azimuth: The angular deviation made by the mean flux transition line with a line normal to the centreline of the

recorded track.

4.9 back surface: The surface of the tape opposite to the magnetic coating which is used to record data.

4.10 byte: An ordered set of bits acted upon as a unit.
4.11 cartridge: A case containing magnetic tape stored on twin hubs.
4.12 Channel bit: A bit after 8-10 transformation.

4.13 Codeword: A word generated by a compression algorithm. The number of bits in a Codeword is variable, and is not

specified by this International Standard.

4.14 Early Warning Point (EWP): A point along the length 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 Physical End of Tape.

4.15 End of Data (EOD): The point on the tape at the end of the group which contains the last user data.

4.16 Entity: A unit of recorded data, comprising an Entity Header and a Record sequence.

4.17 Error Correcting Code (ECC): A mathematical computation yielding check bytes used for the detection and cor-

rection of errors.

4.18 flux transition position: That point which exhibits maximum free-space flux density normal to the tape surface.

4.19 flux transition spacing: The distance along a track between successive flux transitions.

4.20 Frame: A pair of adjacent tracks with azimuths of opposite polarity, in which the track with the positive azimuth

precedes that with the negative azimuth.
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ISO/IEC ISO/IEC 15780:1998 (E)

4.21 Housekeeping Frame: A Frame which contains no user data and which is identified as such by the setting of the

Data Fields therein.

4.22 Logical Beginning of Tape (LBOT): The point along the length of the tape where a recording of data for

interchange commences.

4.23 magnetic tape: A tape which will accept and retain the magnetic signals intended for input, output and storage

purposes on computers and associated equipment.

4.24 Master Standard Amplitude Calibration Tape: A pre-recorded tape on which the standard signal amplitudes

have been recorded in the tracks of positive and negative azimuth, 35,0 μm wide, recorded at a track pitch of 11,0 μm,

on an a.c. erased tape.

Note 1 - The tape includes recording at 1 428,6 ftpmm, 1 904,8 ftpmm, 2 857,1 ftpmm and 3 809,5 ftpmm.

Note 2 - The Master Standard Amplitude Calibration Tape has been established by Sony Corporation of Japan.

4.25 Master Standard Reference Tape: A tape selected as the standard for the Reference Recording Field, Signal

Amplitude, Resolution, Overwrite and Signal-to-Noise ratio.

Note - The Master Standard Reference Tape has been established by Sony Corporation of Japan.

4.26 Memory In Cartridge (MIC): A chip within the case containing information on recordings made on the tape.

4.27 Partition Boundary: The point along the length of a magnetic tape at which a Partition ends and the next Partition

commences.

4.28 Physical Beginning of Tape (PBOT): The point where the leader tape is joined to the magnetic tape.

4.29 Physical End of Tape (PEOT): The point where the trailer tape is joined to the magnetic tape.

4.30 physical recording density: The number of recorded flux transitions per unit length of track, expressed in flux

transitions per millimetre (ftpmm).

4.31 pre-recording condition: The recording levels above which a tape intended for interchange shall not previously

have been recorded.
4.32 processing: The use of an algorithm to transform host data into Codewords.

4.33 processed data: A sequence of Codewords which results from the application of processing to data.

4.34 Processed Record: A sequence of Codewords which results from the application of processing to an Unprocessed

Record.
4.35 record: Related data treated as a unit of information.
4.36 Reference Field: The Typical Field of the Master Standard Reference Tape.

4.37 reprocessing: The use of an algorithm to transform Codewords into data as required by the host.

4.38 Secondary Standard Amplitude Calibration Tape: A tape pre-recorded as specified for the Master Standard

Amplitude Calibration Tape the outputs of which are related to those of the Master Standard Amplitude Calibration

Tape by calibration factors.

Note - Secondary Standard Amplitude Calibration Tapes can be ordered under Part No. SSCT-AIT-1 from Sony Corporation, RME Company, Data Media

Marketing Div. 6-7-35 Kitashinagawa, Shinagawa-ku, Tokyo 141, Japan. In principle such Secondary Standard Amplitude Calibration Tapes will be

available until the year 2006. However, by agreement between ISO and Sony Corporation, this period can be shortened or extended to take into account the

demand for such Secondary Standard Amplitude Calibration Tapes.

4.39 Secondary Standard Reference Tape: A tape the outputs of which are related to those of the Master Standard

Reference Tape by calibration factors.

Note - Secondary Standard Reference Tapes can be ordered under Part No. SSRT-AIT-1 from Sony Corporation, RME Company, Data Media Marketing

Div., 6-7-35 Kitashinagawa, Shinagawa-ku, Tokyo 141, Japan. In principle such Secondary Standard Reference Tapes will be available until the year 2006.

However, by agreement between ISO and Sony Corporation, this period can be shortened or extended to take into account the demand for such Secondary

Standard Reference Tapes.

It is intended that these be used for calibrating tertiary reference tapes for use in routine calibration.

4.40 Separator Mark: A record containing no user data, which is used to separate data.

4.41 Standard Reference Amplitude (SRA): The Average Signal Amplitude from the tracks of positive azimuth of

the Master Standard Amplitude Calibration Tape at a specified physical recording density.

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ISO/IEC 15780:1998 (E) ISO/IEC

4.42 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.

4.43 Typical Field: In the plot of Average Signal Amplitude against the recording field at the physical recording density

of 2 857,1 ftpmm, the field that causes an Average Signal Amplitude equal to 90% of the maximum Average Signal

Amplitude.
4.44 Standard Reference Current: The current that produces the Reference Field.

4.45 Test Recording Current: The current used to record an SRA. It is 1,5 times the Standard Reference Current.

4.46 track: A diagonally positioned area on the tape along which a series of magnetic signals may be recorded.

4.47 unprocessed data: Data which has not been subjected to processing.

4.48 Unprocessed Record: A record of unprocessed data, comprising an integral number of bytes.

5 Conventions and Notations
5.1 Representation of numbers

A measured value is rounded off to the least significant digit of the corresponding specified value. This implies that, for

example, a specified value of 1,26 with a positive tolerance of +0,01 and a negative tolerance of -0,02 allows a range of

measured values from 1,235 to 1,275.
The setting of a bit is denoted by ZERO or ONE.

Bit patterns and numbers in binary notation are represented by strings of digits 0 and 1. Within such strings, X may be used to

indicate that the setting of a bit is not specified within the string.

Bit patterns and numbers in binary notation are shown with the most significant bit to the left and the least significant bit to the

right.

The most significant bit of an 8-bit byte is denoted by b8 and the least significant by b1.

5.2 Names

The names of basic elements, e.g. specific fields, are given with a capital initial letter.

6 Acronyms
AEWP After Early Warning Point
AFN Absolute Frame Number
ATF Automatic Tracking Finding
BAT Block Access Table
ECC Error Correcting Code
EOD End of Data
EWP Early Warning Point
GIT Group Information Table
LBOT Logical Beginning of Tape
LSB Least Significant Byte
LF-ID Logical Frame Identifier
MIC Memory in Cartridge
MSB Most Significant Byte
MSRT Master Standard Reference Tape
PBOT Physical Beginning of Tape
PEOT Physical End of Tape
RAW Read-After-Write
SNR Signal-to-Noise Ratio
msb Most significant bit
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ISO/IEC ISO/IEC 15780:1998 (E)
7 Environment and safety
7.1 Test environment

Tests and measurements made on the tape cartridge to check the requirements of this International Standard shall be carried

out in the following ambient conditions of the air immediately surrounding the drive.

temperature : 23 °C ± 2 °C
relative humidity : 40 % to 60 %
conditioning period before testing : 24 h
7.2 Operating environment

Cartridges used for data interchange shall be capable of operating under the following conditions, as measured within 10 mm

of the tape exit from the drum of the generating or receiving drive:
temperature : 5 °C to 45 °C
relative humidity : 20 % to 80 %
wet bulb temperature : 26 °C max.
There shall be no deposit of moisture on or in the cartridge.

The above conditions include any temperature rise that may occur while operating the drive.

Conditioning before operating:

If a cartridge has been exposed during storage and/or transportation to a condition outside the above values, before use the

cartridge shall be conditioned in the operating environment for a time at least equal to the period during which it has been out

of the operating environment, up to a maximum of 24 h.
Note - Rapid variations of temperature should be avoided.
7.3 Storage environment
The following conditions shall be observed during storage
temperature : 5°C to 32°C
relative humidity : 20 % to 60 %

The stray magnetic field at any point on the tape shall not exceed 4000 A/m. There shall be no deposit of moisture on or in the

cartridge.
7.4 Transportation

Recommended limits for the environment to which a cartridge may be subjected during transportation, and the precautions to

be taken to minimize the possibility of damage, are provided in annex H.
7.5 Safety

The cartridge and its components shall satisfy the requirements of Standard IEC 950. The cartridge and its components shall

not constitute any safety or health hazard when used in the intended manner, or through any foreseeable misuse in an

information processing system.
7.6 Flammability

The cartridge and its components shall be made from materials, which if ignited from a match flame, do not continue to burn

in a still carbon dioxide atmosphere.
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ISO/IEC 15780:1998 (E) ISO/IEC
Section 2 - Requirements for the case
8 Dimensional and mechanical characteristics of the case
8.1 General

Dimensional characteristics are specified for those parameters deemed to be mandatory for interchange and compatible use of

the cartridge. Where there is freedom of design, only the functional characteristics of the elements described are indicated. In

the figures a typical implementation is represented in third angle projection.
Figure 1 is a perspective view of the cartridge seen from the top.
Figure 2 is a perspective view of the cartridge seen from the bottom.
Figure 3 is a perspective view of Reference Planes X, Y and Z.
Figure 4 shows the front side with the lid closed.
Figure 5 shows the left side with the lid closed.
Figure 6 shows the top side with the lid closed.
Figure 7 shows the right side with the lid closed.
Figure 8 shows the rear side with the lid closed.
Figure 9 shows the bottom side, Datum and Support areas.
Figure 10 shows the bottom side with the lid removed.
Figure 11 shows an enlarged view of the Datum and Recognition holes.

Figure 12 shows the cross-sections through the light path holes, the Recognition holes and the Write-inhibit hole.

Figure 13 shows details of the lid when closed, rotating and open.
Figure 14 shows the details of the lid release insertion channel.
Figure 15 shows the lid lock release requirements.
Figure 16 shows the reel lock release requirements.
Figure 17 shows the reel unlock force direction.
Figure 18 shows the lid release force direction.
Figure 19 shows the lid opening force direction.
Figure 20 shows the light path and light window.
Figure 21 shows the internal tape path and light path.
Figure 22 shows the cartridge reel and a cross-section of the cartridge reel.

Figure 23 shows a cross-section of the interface of the cartridge reel with the drive spindle.

Figure 24 shows the tape access cavity clearance requirements.
Figure 25 shows the MIC requirements on an enlarged view of the rear side.
Figure 26 shows the MIC requirements on an enlarged view of the bottom side.

The dimensions are referred to three orthogonal Reference Planes X, Y and Z (see figure 3).

Plane X is perpendicular to Plane Z and passes through the centres of the Datum holes A and B.

Plane Y is perpendicular to Plane X and Plane Z and passes through the centre of Datum hole A.

Datum areas A, B and C lie in Plane Z.
8.2 Overall dimension (figures 5 and 6)
The length of the case shall be
l = 62,5 mm ± 0,3 mm
The width of the case shall be
l = 95,0 mm ± 0,2 mm
The distance from the top side of the case to Reference Plane Z shall be
l = 15,0 mm ± 0,2 mm
The distance from the rear side to Plane X shall be
l = 47,35 mm ± 0,15 mm
The distance from the right side to Plane Y shall be
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ISO/IEC ISO/IEC 15780:1998 (E)
l = 13,0 mm ± 0,1 mm
8.3 Holding areas

The holding areas shown shaded in figure 6 shall be the areas along which the cartridge shall be held down when inserted into

the drive. The distance of the holding areas from Plane X shall be
l = 12,0 mm max.
The width when measured from the edges of the case shall be
l = 3,0 mm min.
8.4 Cartridge insertion

The cartridge shall have asymmetrical features to prevent insertion into the drive in other than the correct orientation. These

consist of a channel, a recess and an incline.

The channel (figures 4 and 14) shall provide for an unobstructed path, when the lid is closed and locked, to unlock the lid. The

distance of the channel from Plane Y shall be
l = 79,6 mm ± 0,2 mm
There shall be a chamfer at the beginning of the channel defined by
l = 1,0 mm ± 0,1 mm
l = 1,5 mm ± 0,1 mm
An additional chamfer further into the channel shall be defined by
l = 0,7 mm ± 0,1 mm
l = 1,9 mm ± 0,1 mm
l = 3,65 mm ± 0,10 mm
The innermost width of the channel shall be
l = 1,0 mm min.
There shall be a chamfer on the lid defined by
l = 1,2 mm ± 0,1 mm
l = 0,8 mm ± 0,1 mm
l = 1,2 mm ± 0,1 mm
l = 0,5 mm ± 0,1 mm
The distance from the left side of the case to the release pin shall be
l = 0,2 mm ± 0,2 mm
The height of the insertion area shall be
l = 2,3 mm min.
+ 0,2 mm
l = 2,5 mm
- 0,0 mm

The recess is located on the right side of the cartridge. The position and dimensions (figures 7 and 10) shall be defined by

l = 7,5 mm max.
l = 11,0 mm ± 0,2 mm
l = 1,5 mm ± 0,1 mm
The depth of the recess shall be
l = 1,5 mm ± 0,1 mm

The incline (figure 13) is part of the lid structure. The distance of the incline from Plane X shall be

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ISO/IEC 15780:1998 (E) ISO/IEC
+ 0,0 mm
l = 7,7 mm
- 2,5 mm
The angle of the incline shall be
a = 17,5° ± 4,0°
The incline shall end at its intersection with radius r (see 8.13).
8.5 Window (figure 1)

A window may be provided on the top side so that parts of the reels are visible. The window, if provided, shall not extend

beyond the height of the cartridge.
8.6 Loading grips (figures 5 and 7)

The cartridge shall have a recessed loading grip on the right and on the left side to allow handling by an automatic loading

mechanism.
The distance from Plane X to the centreline of the loading grip shall be
l = 39,35 mm ± 0,20 mm

The distance of the side edges of the loading grips from Plane Z and from the top side, respectively, shall be

l = 1,5 mm ± 0,1 mm
The width of the indent shall be
l = 5,0 mm ± 0,3 mm
The depth of the indent shall be
l = 2,0 mm ± 0,2 mm
The angle of the indent shall be
a = 90° ± 5°
8.7 Label areas (figures 6 and 8)

A portion of the rear side of the cartridge and a portion of the top side of the cartridge may be used for labels. The portion and

the size of the labels shall not interfere with
...

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