ISO/IEC 11557:1992
(Main)Information technology — 3,81 mm wide magnetic tape cartridge for information interchange — Helical scan recording — DDS-DC format using 60 m and 90 m length tapes
Information technology — 3,81 mm wide magnetic tape cartridge for information interchange — Helical scan recording — DDS-DC format using 60 m and 90 m length tapes
Specifies the physical and magnetic characteristics and also the quality of the recorded signal, the recording method and the recorded format (Digital Data Storage - Data Compression, DDS-DC), thereby allowing data interchange between drives by means of such magnetic tape cartridges.
Technologies de l'information — Cartouche de bande magnétique de 3,81 mm de large pour l'échange d'information — Enregistrement hélicoïdal — Format DDS-DC utilisant des bandes de 60 m et 90 m de long
General Information
Standards Content (Sample)
INTERNATIONAL lSO/IEC
STANDARD
11557
First edition
1992-I 2-l 5
Information technology - 3,81 mm wide
magnetic tape cartridge for information
interchange - Helical scan recording -
DDS=DC format using 60 m and 90 m
length tapes
Technologies de /‘information - Cartouche de bande magnetique de
3,81 mm de large pour &change d’information - Enregistrement
hglicoidal - Format DDS-DC utilisant des bandes de 60 m et 90 m de
long
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&O/I EC 11557: -I 992(E)
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ISOlIEC 11557: 1992 (E)
Page
Contents
1
Section 1 - General
1
1 Scope
1
2 Normative references
2
3 Conformance
2
31 . Magnetic tape cartridge
2
32 . Generating system
2
Receiving system
33 .
3
4 Definitions
Absolute Frame Number
41 .
42 . Access Point
algorithm
43 .
44 . Automatic Track Finding
Area ID
45 .
46 . Average Signal Amplitude
47 . azimuth
48 . back surface
49 byte
4’10 cartridge
4’11 Channel Bit
4’12 Codeword
4’13 Data Format ID
Early Warning Point
4’14
4’15 End of Data
4’16 Entity
4’17 Error Correcting Code
flux transition position
4’18
4’19 flux transition spacing
4’20 frame
Housekeeping Frame
4’21
4’22 Logical Beginning of Tape
4’23 magnetic tape
4’24 Master Standard Amplitude Calibration Tape
4’25 . Master Standard Reference Tape
o ISO/IEC 1992
All rights reserved. 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 per-
mission in writing from the publisher.
lSO/IEC Copyright Office l Case Postale 56 l CH-1211 Geneve 20 l Switzerland
Printed in Switzerland
ii
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ISO/IEC 11557:1992 (E)
4
4.26 Optimum Recording Field
4
Partition boundary
4.27
4
4.28 Physical Beginning of Tape
4
4.29 Physical End of Tape
4
physical recording density
4.30
4
4.31 pre-recording condition
4
4.32 processing
4
4.33 processed data
5
Processed Record
4.34
5
4.35 Processed Record Sequence
5
4.36 Record
5
4.37 Reference Recording Field
5
reprocessing
4.38
5
4.39 Secondary Standard Amplitude Calibration Tape
5
4.40 Secondary Standard Reference Tape
5
4.41 Separator Mark
5
4.42 Standard Reference Amplitude
5
4.43 Tape Reference Edge
5
Test Recording Current
4.44
5
4.45 track
5
4.46 Unprocessed Data
5
4.47 Unprocessed Record
5
Virtual End of Tape
4.48
5 Environment and safety
51 . Testing environment
52 . Operating environment
53 . Storage environment
54 . Transportation
55 . Safety
56 . Flammability
6
Section 2 - Requirements for the case
6
6 Dimensional and mechanical characteristics of the case
6
61 . General
7
62 . Overall dimensions (figures 6 and 7)
8
Loading grip (figure 6)
63 l
8
64 . Holding areas (figure 6)
8
65 . Notches of the lid (figures 5 and 8)
8
66 b Lid dimensions (figures 6 to 8)
9
67 . Optical detection of the beginning and end of tape (figures 9 and 12)
10
68 . Bottom side (figures 10 and 11)
10
6.8.1 Locking mechanism of the slider
10
6.8.2 Access holes
11
Recognition, sub-datums, and write-inhibit holes
6.8.3
12
6.8.4 Datum holes
13
6.8.5 Access room for tape guides
13
Holes for accessing the hubs
6.8.6
13
6.8.7 Internal structure of the lower half (figure 12)
. . .
111
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ISO/IEC 11557: 1992 (E)
14
Light path (figure 12)
6.8.8
15
6b8.9 Support Areas (figure 13)
15
6.8.10 Datum Areas (figure 13)
15
6,8.11 Relationship between Support and Datum Areas and Reference Plane 2 (figure 14)
15
Hubs (figures 15 and 16)
69
16
6’10 Leader and trailer attachment
16
6’11 Interface between the hubs and the drive spindles (figure 17)
16
6’12 Opening of the lid (figure 18)
16
Release of the hub locking mechanism (figures 19 and 20)
6’13
17
6’14 . Label areas (figures 21 and 22)
28
Section 3 - Requirements for the unrecorded tape
28
7 Mechanical, physical and dimensional characteristics of the tape
28
71 Materials
b
28
72 . Tape length
28
7.2,1 Length of magnetic tape
28
7.2.2 Length of leader and trailer tapes
28
73 Tape width
28
7:4 Discontinuities
28
7s Total thickness
28
76 . Longitudinal curvature
29
77
. Cupping
29
78 b Coating adhesion
30
79 Layer-to-layer adhesion
30
7’10 . Tensile strength
30
7blObl Breaking strength
30
Yield strength
7.10,2
30
7.11 Residual elongation
30
7.12 Electrical resistance of coated surfaces
31
7.13 Light transmittance of the tape
31
8 Magnetic recording characteristics
32
Optimum Recording Field
81 b
32
82 . Signal Amplitude
32
Resolution
83 b
33
84 b Overwrite
33
Physical recording densities of 750,6 ftpmm and 3 002 ftpmm
8.4J
33
8,4,2 Physical recording densities of 83,4 ftpmm and 1 001 ftpmm
33
85 b Ease of erasure
33
Tape quality
86 .
33
8b6.1 Missing pulses
33
Missing pulse zone
8,6,2
34
Signal-to-Noise Ratio (S/N) characteristic
87 b
34
Section 4 - Requirements for an interchanged tape
34
Format
9
iV
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ISO/IEC 11557: 1992 (E)
General
91 b 34
92 b Basic Groups
35
9e2.1 Entity
35
9,2,2 Group Information Table 37
Block Access Table (BAT)
9b2.3 39
93 b Sub-Groups 42
9b3J Gl Sub-Group
42
9,3,2 G2 Sub-Group - randomizing 43
9b3.3 G3 Sub-Group
43
9.3.4 G4 Sub-Group 46
9.3*5 Main Data Block
49
94 b Sub-Data Area 51
9.4,1 Pack item Number 1 51
9,4,2 Pack item Number 2 52
9.4*3 Pack item Number 3
53
9.4.4 Pack item Number 4 54
9.4*5
Pack item Number 5 55
9.4.6 Pack Item Number 6 56
9.4.7 Pack item Number 7 57
9.4.8 Pack item Number 8 58
9.4.9 Sub Data Block
58
10 Method of recording 62
10.1 Physical recording density 62
lOb2 Long-term average bit cell length 62
62
10.3 Short-term average bit cell length
10.4 Rate of change 62
10.5 Bit shift 62
10.6 Read Signal Amplitude 62
10.7 Maximum recorded levels 62
11 62
Track geometry
11.1 Track configuration 62
11,2 Average track pitch 63
11.3 Variations of the track pitch 63
11,4 Track width 63
11.5 Track angle 64
11.6 64
Track edge linearity
11.7 Track length 64
11.8 Ideal centreline 64
QPe
11.9 Azim uth a ngles 64
12 Recording of blocks on the tape 64
12.1 64
Recorded Main Data Block
12,2 Recorded Sub Data Block 64
12.3 Margin Blocks, Preamble Blocks and Postamble Blocks
64
12.4 Spacer Blocks 64
V
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ISO/IEC 11557: 1992 (E)
65
13 Format of a track
65
-~~ 13.1 Track capacity
65
13.2 Positioning accuracy
65
13.3 Tracking scheme
68
14 Layout of a Single Data Space tape
68
14bl Device Area
69
14,2 Reference Area
69
14.3 Position tolerance band No. 1
69
14.4 System Area
69
14b5 Data Area
70
14b5.1 Vendor Group
70
14e5.2 Recorded Data Group
70
14b5.3 ECC3
71
14.5.4 Multiple recorded instances
71
14.5,5 Repeated frames
72
Appending and overwriting
14b5.6
74
14.6 EOD Area
74
14.7 Post-EOD Area
74
Early Warning Point - EWP
14.8
74
14.9 Initialization
75
15 Layout of Partitioned tape
75
Overall magnetic tape layout
15.1
76
15blbl Device Area
76
15.1.2 Partition 1
77
15blb3 Partition 0
77
Area ID
15.2
77
15.3 System Area Pack Items No. 3 and No. 4
77
Empty partitions
15b4
77
15.5 Initialization of Partitioned tapes
78
16 Housekeeping frames
78
16.11 Amble Frames
78
16.2 System Log Frames
78
Tape Management Frames
16,3
Annexes
79
I
Measurement of the light transmittance of the prisms
A
81
m
B Recognition holes
82
m
Means to open lid
C
83
D- Measurement of light transmittance of tape and leaders
86
m
E Measurement of Signal to Noise Ratio
87
m
F Method for determining the Nominal and the Maximum Allowable Recorded Levels
89
C;: - Representation of 8-Bit bytes by lo-bit patterns
vi
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ISOIIEC 11557: 1992 (E)
H - Measurement of bit shift
95
J - Recommendations for transportation
98
K - Method of measuring track edge linearity
99
L - Read-After-Write
100
M - Example of the content of a Basic Group No. 0
101
N - Registration of algorithms
102
vii
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ISO/IEC 11557: 1992 (E)
Foreword
IS0 (the International Organization for Standardization) and IEC (the International Electrotechnical
Commission) form the specialized system for worldwide standardization. National bodies that are members of
IS0 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. IS0 and IEC technical
committees collaborate in fields of mutual interest. Other international organizations, governmental and non-
governmental, in liaison with IS0 and IEC, also take part in the work.
In the field of information technology, IS0 and IEC have established a joint technical committee, ISO/IEC
JTCl. 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.
International Standard ISO/IEC 11557 was prepared by the European Computer Manufacturers Association (as
Standard ECMA-150) and was adopted, under a special “fast-track procedure”, by Joint Technical Committee
ISO/IEC JTCl, Information technology, in parallel with its approval by national bodies of IS0 and IEC.
Annexes A,D to H and K form an integral part of this International Standard. Annexes B, C, J, L to N are for
information only.
Patents
During the preparation of the ECMA standard, information was gathered on patents upon which application of
the standard might depend. Relevant patents were identified as belonging to Hewlett Packard Limited and the
Sony Corporation. However, neither ECMA, nor ISO/IEC can give authoritative or comprehensive information
about evidence, validity or scope of patent and like rights. The patent holders have stated that licences will be
granted under reasonable and non-discriminatory terms. Communications on this subject should be addressed to
Hewlett-Packard Limited
Computer Peripherals Bristol
Fil ton Road
Stoke Gifford
Bristol BS12 642
United Kingdom
Sony Corporation
Licensing and Trademark Division
6-7-35 Kitashinagawa
Shinagawa-ku
Tokyo 141
Japan
. . .
VI11
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ISO/IEC 11557: 1992 (E)
Introduction
This International Standard ISO/IEC 11557 incorporates all the specifications of ISO/IEC 10777, together with
extensions and modifications which specify the additional features of the DDS-DC recorded format. The
specifications of the tape, cartridge, recorded signal, recording method and most of the recorded format are
identical with those in ISO/IEC 10777.
This International Standard specifies two types of
tape cartridge. For type A, the magnetic tape has a nominal
thickness of 13 pm. For type B, the magnetic tape has a nominal thickness of 9 pm.
It is not intended that this International Standard replace ISO/IEC 10777, Cartridges and drives which conform
to ISO/IEC 10777 may, in addition, conform to this International Standard, but only if they support those
features herein which are not in ISO/IEC 10777.
ix
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ISO/IEC 11557:1992 (E)
INTERNATIONAL STANDARD
Information technology - 341 mm wide magnetic tape cartridge for
information interchange - Helical scan recording - DDSlDC format using
60 m and 90 m length tapes
Section 1 - General
1
Scope
This International Standard specifies the physical and magnetic characteristics of a 3,81 mm wide magnetic
tape cartridge to enable interchangeability of such cartridges. It also specifies the quality of the recorded
signal, the recording method and the recorded format, thereby allowing data interchange between drives by
means of such magnetic tape cartridges.
of this International
This International Standard specifies two types of cartridge which, for the purpose
Standard, are referred to as Type A and Type B.
For Type A, the magnetic tape is nominally 13 pm thick and has a length of up to 60,5 m.
For Type B, the magnetic tape is nominally 9 pm thick and has a length of up to 92,0 m.
The recorded format, known as Digital Data Storage - Data Compression (DDS-DC), includes all the features
of the DDS recorded format specified in ISO/lEC 10777, with additional features which support the recording
of data which has been processed, by the generating system, after receipt from the host and prior to recording.
Such features are intended for, but are not limited to, the support of one or more data compression Algorithms.
Information interchange between systems by means of this International Standard also requires the use, at a
minimum, of a labelling and file structure, an interchange code and a Processing Algorithm which are agreed
upon by the interchange parties. It is not within the scope of this International Standard to specify the labelling
and file structure, the interchange code or the Processing Algorithm.
2 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 Standards are encouraged to investigate the
possibility of applying the most recent editions of the standards indicated below. Members of IEC and IS0
maintain registers of currently valid International Standards.
ISO/R 527: 1966, Plastics - Determination of tensile properties.
IS0 1302:. 2, , Technical Drawings - Method of indicating surface texture on drawings.
ISO/IEC 10777: 1991, Information technology - 3,81 mm wide magnetic tape cartridge for information
interchange - Helical scan recording - DDS format.
I) Information technology - Procedure for the registration of algorithms for the lossless
ISO/IEC 11576:. ,
compression of data.
IEC 950: 1991, Safety of Information technology equipment, including electrical business equipment.
I) To be published.
2, Currently under revision.
.
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ISO/IEC 11557: 1992 (E)
3 Conformance
31 . Magnetic tape cartridge
A tape cartridge shall be in conformance with this International Standard if it meets all the mandatory
requirements specified herein for either Type A or Type B. The tape requirements shall be satisfied throughout
the extent of the tape.
In particular, in order to be in conformance with this International Standard, a recorded tape shall contain at
least one recorded Entity.
For each recorded Entity the Algorithm used for Processing the data therein shall have been registered, and the
regi stration identification shall be included, when appropriate, in Byte No. 3 of the Entity Header.
A recorded tape shall be either a Single Data Space Tape or a Partitioned Tape.
32 . Generating system
A system generating a magnetic tape cartridge for interchange shall be entitled to claim 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 particular it shall be
able to record unprocessed data, and processed data within entities.
A claim of conformance shall state which of the following optional features are implemented and which are not
fly necessary repeated frame;;
the performing of a Read-After- Write check and the recording of
t
- the recording of multiple representations of the same
y the generation of EC@3 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
process data received from the host prior to collecting the data into Basic Groups, and
-
the Algorithm registration identification number(s) of the implemented Algorithm(s);
-
whether Type A cartridges or Type B cartridges or both are supported.
33 . Receiving system
A system receiving a magnetic tape cartridge for interchange shall be entitled to claim full 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 recognize repeated frames and to make available to the host, data and Separator Marks from
-
only one of these frames;
the same Basic Group, and to make available to the host,
- be able to recognize multiple representations of
data and Separator Marks from only one of these representations;
- be able to recognize 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 update the System Log(s) if the Write-inhibit Hole state so permits;
- be able to recognize processed data within an entity, identify the Algorithm used, and make the Algorithm
registration number available to the host;
- be able to make processed data available to the host.
2
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ISO/IEC 11557: 1992 (E)
In addition a claim of conformance shall state
e whether or not the system is capable of using ECC3 check bytes in a process of error correction;
- whether or not one or more Reprocessing Algorithm(s) are implemented within the system, and are able to
be applied to Processed Data prior to making such data available to the host;
- the Algorithm registration number(s) of the Processing Algorithm(s) for which a complementary
Reprocessing Algorithm is implemented, and
- whether Type A cartridges or Type B cartridges or both are supported.
4 Def’initions
For the purpose of this International Standard, the definitions given in ISO/IEC 10777 and the following
definitions apply.
4.1 Absolute Frame Number (AFN): A sequence number, encoded in the frame.
42
. Access Point: A point, at the start of a Processed Record Sequence, at which the presentation of
Codewords to a Reprocessing Algorithm is required to start, regardless of whether the data of interest
in a retrieval operation starts at that point or at a subsequent point.
43 . algorithm: A set of rules for transforming the logical representation of data.
4, Automatic Track Finding (A F): The method by which tracking is achieved.
45 . Area ID: An identifier defining the area of the tape and specifying the types of frame written.
46 . 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 7,8 mm of
track, exclusive of missing pulses.
47 e azimuth: The angular deviation, in degrees, minutes and seconds of arc, made by the mean flux
transition line with the line normal to the centreline of the recorded track.
48 . back surface: The surface of the tape opposite to the magnetic coating which is used to record data.
49
. byte: An ordered set of bits acted upon as a unit.
4.10 cartridge: A case containing magnetic tape stored on twin hubs.
4.11 Channel Bit:A bit after 8-10 transformation.
4.12 Codeword: A word which is generated by a Processing Algorithm. The number of bits in a Codeword
is variable, and is not defined by this Standard.
4.13 Data Format ID: An identifier specifying which data format is being used on the tape.
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.
End of Data (EOD): The point on the tape at the end of the group which contains the last user data.
4.15
4.16 Entity: A unit of recorded data, comprising a Processed Record Sequence preceded by housekeeping
information.
3
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ISOlIEC 11557:1992 (E)
4.17 Error Correcting Code (ECC): A mathematical computation yielding check bytes used for the
detection and correction 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.
track with the
4.20 frame: A pair of adjacent tracks with azimuths of opposite polarity, in which 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
values in 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.
output and
4.23 magnetic tape: A tape which will accept and retain the magnetic signals intended for input,
storage purposes on computers and associated equipment.
4.24 Master Standard Amplitude Calibration Tape: A prerecorded tape on which the standard signal
amplitudes have been recorded in the tracks of positive azimuth, 23,0 urn wide, at nominal track pitch,
on an a.c.-erased tape.
NOTES
1 The tape includes recordings ma.de at 83,4 ftpmm, 333,6 ftpmm, 500,4 ftpmm, 1 001 ftpmm and 1 501 ftpmm.
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 Reference Recording Field,
Signal Amplitude, Resolution, Overwrite and Signal-to-Noise Ratio.
NOTE 3 - The Master Standard Reference Tape has been established by Sony Corporation.
4.26 Optimum Recording Field: In the plot of Average Signal Amplitude against the recording field at the
physical recording density of 3 002 ftpmm, the field that causes the maximum Average Signal
Amplitude.
4.27 Partition boundary: The point along the length of a magnetic tape at which Partition 1 ends and
Partition 0 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
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ISO/IEC 11557: 1992 (E)
4.34 Processed Record: A sequence of Codewords which results from the application of processing to an
Unprocessed Record.
4.35 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.
4.36 Record: Related data treated as a unit of information.
4.37 Reference Recording Field: The Optimum Recording Field of the Master Standard Reference Tape.
4.38 reprocessing: The use of an Algorithm to transform Codewords into data as required by the host.
4.39 Secondary Standard Amplitude Calibration Tape: A tape pre-recorded as defined for the Master
Standard Amplitude Calibration Tape; the outputs are known and stated in relation to those of the
Master Standard Amplitude Calibration Tape.
NOTE 4 - Secondary Standard Amplitude Calibration Tapes can be ordered from Sony Corporation, Audio Device Business
Department, Component Marketing Group, 4-10-18, Takanawa, Minato-ku, Tokyo 108, Japan, under Part Number TY-7000G
until the year 2000. It is intended that these be used for calibrating tertiary reference tapes for use in routine calibration.
4.40 Secondary Standard Reference Tape: A tape the performance of which is known and stated in
relation to that of the Master Standard Reference Tape.
NOTE 5 - Secondary Standard Reference Tapes can be ordered from Sony Corporation, Major Customer Division, Magnetic
Products Group, 6-7-35, Kitashinagawa, Shinagawa-ku, Tokyo 141, Japan, under Part Number RSD 1079 until the year 2000. It is
intended that these be used for calibrating tertiary reference tapes for use in routine calibration.
4.41 Separator Mark: A record containing no user data, which is used to separate data.
4.42 Standard Reference Amplitude: The Average Signal Amplitude from the tracks of positive azimuth of
the Master Standard Amplitude Calibration Tape at a specified physical recording density.
4.43 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.
4.44 Test Recording Current: The current that produces the Reference Recording Field.
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.
4.48 Virtual End of Tape (VEOT): The point along the length of the magnetic tape within Partition l
which defines the end of the part of Partition 1 which is usable for recording data for interchange.
Environment and safety
5
Unless otherwise stated, the conditions specified below refer to the ambient conditions of the air immediately
surrounding the cartridge.
. Testing environment ’
51
Unless otherwise stated tests and measurements made on the tape cartridge to check the requirements of this
International Standard shall be carried out under the following conditions:
5
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ISO/IEC 11557: 1992 (E)
temperature : 23 OC zk 2 OC
relative humidity : 40 % to 60 %
conditioning period
before testing : 24 h
52 Operating environment
.
Cartridges used for data interchange shall be capable of operating under the following conditions:
temperature : 5 OC to 45 OC
relative humidity : 20 % to 80 %
wet bulb temperature : 26 OC max.
There shall 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 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 6 - Rapid variations of temperature should be avoided.
53 . Storage environment
For long-term or archival storage of cartridges the following conditions shall be observed:
temperature : 5 OC to 32 OC
relative humidity
: 20 % to 60 %
wet bulb temperature : 26 OC max.
The stray magnetic field at any point on the tape shall not exceed 4 000 A/m. There shall be no deposit of
moisture on or in the cartridge.
54 . 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 J.
55 . Safety
The cartridge and its components shall satisfy the requirements of IEC 950.
56 . 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.
Section 2 - Requirements for the case
6 Dimensional and mechanical characteristics of the case
61 l General
The case of the cartridge shall comprise
an upper half,
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ISO/IEC 11557: 1992 (E)
- a lower half,
- a slider movably mounted on the lower half,
- a lid pivotally mounted on the upper half.
In the drawings, using third angle projection, an embodiment of the cartridge is shown as an example.
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 partial view of the rear side.
Figure 4 is a schematic view showing the Reference Planes X, Y and Z.
Figure 5 shows the front side.
Figure 6 shows the top side with the lid in closed position.
Figure 7 shows the left side.
Figure 8 shows the top side with the lid in open position.
Figure 9 shows the left side with the lid in open position.
Figure 10 shows the bottom side with the lid and the slider in closed position.
Figure 11 shows the bottom side with the lid and the slider in open position.
Figure 12 is a view from the top of the inside of the lower half with the upper half removed.
Figure 13 is a view of the bottom half with the lid and the slider in open position.
Figure 14 is a view of the left side with the lid and the slider in open position.
Figure 15 is a top view of a hub.
Figure 16 is a side view of a hub with partial cross-section.
Figure 17 is a partial cross-section through a hub and both halves of the case showing the interface
with the drive spindle.
Figure 18 shows at a larger scale the lid in the open position.
Figures 19, 20 show at a larger scale the functional relationship between the lid and the locking
mechanism of the hubs.
Figures 21, 22 show the label areas on the top and the rear side.
The dimensions are referred to three orthogonal Reference Planes X, Y and Z (figure 4).
62 . Overall dimensions (figures 6 an
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