Information technology -- 8 mm wide magnetic tape cartridge for information interchange -- Helical scan recording AIT-2 with MIC format

This International Standard specifies the physical and magnetic characteristics of an 8 mm wide magnetic tape cartridge containing a memory chip 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.2 with Memory In Cartridge (AIT-2 with MIC) - thereby allowing data interchange between drives by means of such magnetic tape cartridges. The System Log are recorded in the MIC. This International Standard specifies two types of cartridge depending on the thickness of the magnetic tape contained in the case. 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.

Technologies de l'information -- Cartouche à bande magnétique de 8 mm de large pour l'échange d'information -- Enregistrement par balayage en spirale AIT-2 avec format MIC

General Information

Status
Published
Publication Date
07-Feb-2001
Current Stage
9093 - International Standard confirmed
Start Date
21-Aug-2020
Ref Project

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ISO/IEC 18810:2001 - Information technology -- 8 mm wide magnetic tape cartridge for information interchange -- Helical scan recording AIT-2 with MIC format
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INTERNATIONAL ISO/IEC
STANDARD 18810
First edition
2001-02-01
Information technology — 8 mm wide
magnetic tape cartridge for information
interchange — Helical scan recording AIT-2
with MIC format
Technologies de l'information — Cartouche à bande magnétique de 8mm
de large pour l'échange d'information — Enregistrement par balayage en
spirale AIT-2 avec format MIC
Reference number
ISO/IEC 18810:2001(E)
ISO/IEC 2001
---------------------- Page: 1 ----------------------
ISO/IEC 18810:2001(E)
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ii © ISO/IEC 2001 – All rights reserved
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ISO/IEC 18810:2001(E)
Contents
Section 1 – General 1
1 Scope 1
2 Conformance 1
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 3
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
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 Secondary Standard Amplitude Calibration Tape 3
4.38 Secondary Standard Reference Tape 3
4.39 Separator Mark 4
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ISO/IEC 18810:2001(E)
4.40 Standard Reference Amplitude (SRA) 4
4.41 Tape Reference Edge 4
4.42 Typical Field 4
4.43 Standard Reference Current 4
4.44 Test Recording Current 4
4.45 track 4
4.46 unprocessed data 4
4.47 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
Section 2 - Requirements for the case 6
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 13
8.15 Reel access holes 13
8.16 Interface between the reels and the drive spindles 14
8.17 Light path 15
8.18 Position of the tape in the case 15
8.19 Tape path zone 16
8.20 Tape access cavity 16
8.21 Tape access cavity clearance 16
8.22 Requirements for the MIC 16
8.23 Recognition recesses 18
Section 3 - Requirements for the unrecorded tape 38
9 Mechanical, physical and dimensional characteristics of the tape 38
9.1 Materials 38
9.2 Tape length 38
9.2.1 Length of magnetic tape 38
9.2.2 Length of leader and trailer tapes 38
9.2.3 Length of the splicing tapes 38
9.3 Tape width 38
9.3.1 Width of magnetic, leader and trailer tapes 38
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ISO/IEC 18810:2001(E)
9.3.2 Width and position of the splicing tape 38
9.4 Discontinuities 39
9.5 Tape thickness 39
9.5.1 Thickness of the magnetic tape 39
9.5.2 Thickness of the leader and trailer tape 39
9.5.3 Thickness of the splicing tape 39
9.6 Longitudinal curvature 39
9.7 Cupping 39
9.8 Coating adhesion 39
9.9 Layer-to-layer adhesion 40
9.10 Tensile strength 40
9.10.1 Breaking strength 40
9.10.2 Yield strength 40
9.11 Residual elongation 40
9.12 Electrical resistance of the recording surface 40
9.13 Tape winding 41
9.14 Light transmittance of the tape 41
9.15 Recognition stripe 41
10 Magnetic recording characteristics 42
10.1 Typical Field 42
10.2 Signal Amplitude 42
10.3 Resolution 42
10.4 Overwrite 42
10.5 Ease of erasure 43
10.6 Tape quality 43
10.6.1 Missing pulses 43
10.6.2 Missing pulse zone 43
10.7 Signal-to-Noise Ratio (SNR) characteristic 43
Section 4 - Requirements for an interchanged tape 44
11 Format 44
11.1 General 44
11.2 Basic Groups 44
11.2.1 Entity 45
11.2.2 Group Information Table 45
11.2.3 Block Access Table (BAT) 47
11.3 Sub-Groups 50
11.3.1 G1 Sub-Group 50
11.3.2 G2 Sub-Group - Randomizing 51
11.3.3 G3 Sub-Group 52
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 61
12.1 Physical recording density 62
12.2 Long-term average bit cell length 62
12.3 Short-term average bit cell length 62
12.4 Rate of change 62
12.5 Bit shift 62
12.6 Read signal amplitude 62
12.7 Maximum recorded levels 62
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ISO/IEC 18810:2001(E)
13 Track geometry 62
13.1 Track configuration 62
13.2 Average track pitch 63
13.3 Variations of the track pitch 63
13.4 Track width 63
13.5 Track angle 63
13.6 Track edge straightness 63
13.7 Track length 63
13.8 Azimuth angles 63
14 Recorded patterns 64
14.1 Recorded Data Block 64
14.2 Margin blocks 64
15 Format of a track 64
15.1 Track structure 64
15.2 Positioning accuracy 65
15.3 Tracking scheme 66
16 Layout of the tape 66
16.1 Device Area 67
16.2 Reference Area 67
16.3 Position Tolerance Band No. 1 68
16.4 System Area 68
16.4.1 System Preamble 68
16.4.2 System Log 68
16.4.3 System Postamble 72
16.4.4 Position Tolerance Band No. 2 72
16.4.5 Vendor Group Preamble 72
16.5 Data Area 72
16.5.1 Vendor Group 72
16.5.2 Recorded Data Group 72
16.5.3 ECC3 72
16.5.4 Multiple Recorded Instances 73
16.5.5 Repeated Frames 73
16.5.6 Appending and overwriting 74
16.6 EOD Area 75
16.7 Optional Device Area 75
16.8 Logical End Of Tape (LEOT) 76
16.9 Logical Beginning of Tape (LBOT) 76
16.10 Early Warning Point - EWP 76
16.11 Empty Partition 76
16.12 Initialization 76
17 Housekeeping Frames 77
17.1 Amble Frames 77
17.2 System Amble Frames 77
18 Content of the MIC 78
Annexes
A- Measurement of light transmittance 79
B- Measurement of Signal-to-Noise Ratio 82

C- Method for determining the nominal and the maximum allowable recorded levels (pre-recording condition) 83

D- Representation of 16-bit words by 20-Channel bits patterns 84
E- Measurement of bit shift 86
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ISO/IEC 18810:2001(E)
F- Method of measuring the straightness of track edges 88
G- ECC calculation 89
H- Recommendations for transportation 92
J- Read-After-Write 93
K- Example of the content of a Basic Group No. 0 94
L- Examples of chip 95
© ISO/IEC 2001 – All rights reserved vii
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ISO/IEC 18810:2001(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.

International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3.

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.

Attention is drawn to the possibility that some of the elements of this International Standard may be the subject of patent rights.

ISO and IEC shall not be held responsible for identifying any or all such patent rights.

International Standard ISO/IEC 18810 was prepared by ECMA (as ECMA-292) and was adopted, under a special “fast-track

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

bodies of ISO and IEC.

Annexes A to G form a normative part of this International Standard. Annexes H to L are for information only.

viii © ISO/IEC 2001 – All rights reserved
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INTERNATIONAL STANDARD ISO/IEC 18810:2001(E)
Information technology — 8 mm wide magnetic tape cartridge for information
interchange — Helical scan recording AIT-2 with MIC format
Section 1 – General
1Scope

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

containing a memory chip 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.2 with Memory In

Cartridge (AIT-2 with MIC) - thereby allowing data interchange between drives by means of such magnetic tape cartridges.

TheSystemLogarerecordedintheMIC.

This International Standard specifies two types of cartridge depending on the thickness of the magnetic tape contained in the

case.

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. In addition, such a drive shall be able to record the System Log in the MIC.

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 read the System Log recorded in the MIC,

� 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.
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ISO/IEC 18810:2001(E)
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;

� 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 normative documents contain provisions which, through reference in this text, constitute provisions of this

International Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not

apply. However, parties to agreements based on this International Standard are encouraged to investigate the possibility of

applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the

normative document referred to applies. Members of ISO and IEC maintain registers of currently valid International Standards.

ISO 527-3:1995 Plastics — Determination of tensile properties — Part 3: Test conditions for films and sheets.

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.
IEC 60950:1999 Safety of information technology equipment.
4 Terms and definitions

For the purposes of this International Standard the following terms and definitions apply.

4.1 Absolute Frame Number (AFN): A sequence number encoded in a Frame.

4.2 a.c. erase: A process of erasure using 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: The elements by which, after modulation, the binary values ZERO and ONE are represented on tape by

different residual magnetisms.

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.

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ISO/IEC 18810:2001(E)

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.

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 recorded at a track pitch of 11,0 �m, on an a.c.

erased tape.
Note 1 - The tape includes recording at 2 053,6 ftpmm and 4 107,1 ftpmm.

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

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.

4.26 Memory In Cartridge (MIC): A chip within the case containing information about the cartridge and its

recordings.

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 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-2 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 for a period of 10 years from the publication of the first Edition of this International Standard.

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

such Secondary Standard Amplitude Calibration Tapes.

4.38 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-2 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 for a period of 10 years from the publication of the first Edition of this International Standard. However, by agreement between

ECMA 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.

© ISO/IEC 2001 – All rights reserved 3
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ISO/IEC 18810:2001(E)

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

4.40 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.

4.41 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.

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

of 4 107,1 ftpmm, the field that causes an Average Signal Amplitude equal to 90% of the maximum Average Signal

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

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

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

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

4.47 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
LEOT Logical End 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 18810:2001(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 min.
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�Cto 45�C
relative humidity : 20 % to 80 %
wet bulb temperature : 26�Cmax.
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�Cto 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 60950. 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 18810:2001(E)
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.
Figure 25 shows the Access Holes of the MIC on the rear side.
Figure 26 shows the Access Holes of the MIC on 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
l = 13,0 mm� 0,1 mm
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ISO/IEC 18810:2001(E)
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 inser
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