ISO/IEC 15718:1998
(Main)Information technology — Data interchange on 8 mm wide magnetic tape cartridge — Helical scan recording — HH-1 format
Information technology — Data interchange on 8 mm wide magnetic tape cartridge — Helical scan recording — HH-1 format
Technologies de l'information — Échange de données sur cartouche de bande magnétique de 8 mm de large — Enregistrement par balayage en spirale — Format HH-1
General Information
Standards Content (Sample)
INTERNATIONAL ISO/IEC
STANDARD 15718
First edition
1998-08-01
Information technology — Data interchange
on 8 mm wide magnetic tape cartridge —
Helical scan recording — HH-1 format
Technologies de l'information — Échange de données sur cartouche de
bande magnétique de 8 mm de large — Enregistrement par balayage en
spirale — Format HH-1
Reference number
B C
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 Address 2
4.2 a.c. erase 2
4.3 algorithm 2
4.4 Area ID 2
4.5 Average Signal Amplitude 2
4.6 azimuth 2
4.7 back surface 2
4.8 bit cell 2
4.9 byte 2
4.10 cartridge 2
4.11 Channel bit 2
4.12 compressed data 2
4.13 Cyclic Redundancy Check (CRC) character 2
4.14 Data Format ID 2
4.15 End of Data (EOD) 2
4.16 Error Correcting Code 2
4.17 flux transition position 2
4.18 flux transition spacing 2
4.19 Frame 2
4.20 Logical Beginning of Tape (LBOT) 2
4.21 record 2
4.22 magnetic tape 2
4.23 Master Standard Reference Tape 3
4.24 Partition Boundary 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
ii
ISO/IEC ISO/IEC 15718:1998 (E)
4.25 Physical Beginning of Tape (PBOT) 3
4.26 Physical End of Tape (PEOT) 3
4.27 physical recording density 3
4.28 Reference Field 3
4.29 Secondary Standard Reference Tape 3
4.30 Standard Reference Amplitude (SRA) 3
4.31 Standard Reference Recording Current 3
4.32 Tape Reference Edge 3
4.33 Test Recording Current 3
4.34 track 3
4.35 Typical Field 3
4.36 uncompressed data 3
5 Conventions and notations 3
5.1 Representation of numbers 3
5.2 Names 4
6 Acronyms 4
7 Environment and safety 4
7.1 Testing environment 4
7.2 Operating environment 4
7.3 Storage environment 4
7.4 Transportation 4
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 12
8.15 Reel access holes 13
8.16 Interface between the reels and the drive spindles 13
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 requirements 16
Section 3 - Requirements for the Unrecorded Tape 33
9 Mechanical, physical and dimensional characteristics of the tape 33
9.1 Materials 33
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9.2 Tape length 33
9.2.1 Magnetic tape 33
9.2.2 Leader and trailer tapes 33
9.2.3 Splicing tape 33
9.3.1 Width of magnetic tape 33
9.3.2 Width of leader and trailer tapes 33
9.3.3 Width and position of splicing tape 33
9.4 Discontinuities 33
9.5 Thickness 33
9.5.1 Thickness of the magnetic tape 33
9.5.2 Thickness of leader and trailer tape 34
9.5.3 Thickness of the splicing tape 34
9.6 Longitudinal curvature 34
9.7 Cupping 34
9.8 Coating adhesion 34
9.9 Layer-to-layer adhesion 35
9.10 Tensile strength 35
9.10.1 Breaking strength 35
9.10.2 Yield strength 35
9.11 Residual elongation 35
9.12 Electrical resistance of coated surfaces 35
9.13 Tape winding 36
9.14 Light transmittance of tape 36
9.15 Media Recognition System (MRS) 36
10 Magnetic recording characteristics 37
10.1 Typical Field 37
10.2 Signal amplitude 38
10.3 Resolution 38
10.4 Overwrite 38
10.5 Ease of erasure 38
10.6 Tape quality 38
10.6.1 Missing pulses 38
10.6.2 Missing pulse zone 38
10.7 Signal-to-Noise Ratio (SNR) 39
Section 4 - Requirements for an interchanged tape 40
11 Format 40
11.1 General 40
11.2 Information Matrix 41
11.2.1 Loading the Information Matrix 41
11.3 Sync Block 53
11.3.1 Sync Block Data 53
11.3.2 Sync Block Header 53
11.3.3 Sync Block Header in Preamble Zone 54
11.4 Data Zone 54
11.4.1 Identification and arrangement of Information Blocks in the Data Zone of a Frame 54
11.4.2 Identification and arrangement of Sync Blocks in Data Zone of a Track 55
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ISO/IEC ISO/IEC 15718:1998 (E)
12 Method of recording 55
12.1 Physical recording density 55
12.2 Long-term average bit cell length 55
12.3 Short-term average bit cell length 55
12.4 Rate of change 56
12.5 Bit shift 56
12.6 Read signal amplitude 56
12.7 Recording current 56
13 Track geometry 56
13.1 Track configuration 56
13.2 Average track pitch 57
13.3 Variations of the track pitch 57
13.4 Track width 57
13.5 Track angle 57
13.6 Track edge linearity 57
13.7 Track length 57
13.8 Data Zone reference 57
13.9 Azimuth angles 57
14 Recording pattern 57
14.1 Recorded Sync Block 57
14.2 Preamble Zone 57
14.3 Postamble Zone 57
15 Format of a track 58
15.1 Track capacity 58
15.2 Positioning accuracy 58
15.3 Tracking scheme 58
16 Layout of a Single Data Space tape 58
16.1 Frame type 58
16.1.1 Data Frame 58
16.1.2 Gap Frame 58
16.1.3 Long File Mark Frame 58
16.1.4 Short File Mark Frame 58
16.1.5 Set Mark Frame 58
16.1.6 End of Data Frame 58
16.1.7 Format Frame 59
16.1.8 Data Frame in System Area 59
16.2 Device Area 59
16.3 Reference Area 59
16.4 System Area 59
16.4.1 Guard Band No.1 59
16.4.2 System Log Preamble 59
16.4.3 System Log 59
16.4.4 System Log Postamble 59
16.4.5 Guard Band No.2 59
16.4.6 Data Area Preamble 59
16.5 Data Area 59
16.5.1 Long File Mark 59
16.5.2 Short File Mark 59
16.5.3 Set Mark 60
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16.5.4 Write operation 60
16.5.5 Append and overwrite operations 60
16.5.6 Rewritten Frames 60
16.6 EOD Area 60
16.7 Post-EOD Area 60
17 Layout of a partitioned tape 61
17.1 Overall magnetic tape layout 61
17.1.1 Device Area 61
17.1.2 Partition 1 61
17.1.3 Partition 0 62
17.2 Partition Identification 62
Annexes
A - Measurement of light transmittance of tape and leaders 63
B - Measurement of Signal-to-Noise Ratio 66
C - Representation of 8-bit bytes by 10-bit patterns 67
D - Measurement of bit shift 75
E - Measurement of track edge linearity tolerance 78
F - Recommendations for transportation 79
G - Example of the content of a Data Block in the System Area 80
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ISO/IEC ISO/IEC 15718:1998 (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.
International Standard ISO/IEC 15718 was prepared by JISC (as Standard JIS X.6143-1997) with document support and
contribution from ECMA (ECMA-247) 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 E form an integral part of this International Standard. Annexes F and G are for information only.
.
vii
INTERNATIONAL STANDARD ISO/IEC ISO/IEC 15718:1998 (E)
Information technology — Data interchange on 8 mm wide magnetic tape
cartridge — Helical scan recording — HH-1 format
Section 1 - General
1Scope
This International Standard specifies the physical and magnetic characteristics of an 8 mm wide magnetic tape cartridge so as to
provide physical interchange of such cartridges between drives. It also specifies the quality of the recorded signals, the
recording method and the recorded format - called HH-1 format - thereby allowing for full data interchange between drives by
means of such magnetic tape cartridges.
Information interchange between systems also requires, as 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.
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 rewritten frames;
− the generation of ECC3 Blocks.
In addition a claim of conformance shall state
− whether or not, registered data compression algorithm(s) are implemented within the system and are able to compress data
received from the host, and
− the registered identification number(s) of the implemented 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 recognize rewritten frames and to make available to the host, data and File Marks from only one of these frames;
− be able to recognize a ECC3 Block, and ignore it if the system is not capable of using ECC3 check bytes in a process of
error correction;
− be able to recognize compressed data, identify the algorithm used, and make the algorithm registration number available to
the host;
−
be able to make compressed 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;
− whether or not one or more decompression 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 data compression algorithm(s) for which a complementary data decompression
algorithm is implemented.
− whether or not the system is capable of updating the System Log(s) if the Write-inhibit Hole state so permits.
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 527-1:1993, Plastics — Determination of tensile properties — Part 1: General principles.
ISO 1302:1992, Technical drawings — Method of indicating surface texture.
ISO/IEC 11576:1995, Information technology — Procedure for the registration of algorithms for the lossless compression
of data.
IEC 950:1991, Safety of information technology equipment.
4 Definitions
For the purposes of this International Standard, the following definitions apply.
4.1 Absolute Frame Address: A sequence number, encoded in the Frame.
4.2 a.c. erase: A process of erasure utilising alternating magnetic fields of decaying intensity.
4.3 algorithm: A set of rules for transforming the logical representation of data.
4.4 Area ID:
Identifier of an area of the tape.
4.5 Average Signal Amplitude: The average peak-to-peak value of the output signal from the read head at the
specified physical recording density over a minimum of 20,7 mm of track, exclusive of missing pulses.
4.6 azimuth: The angular deviation, in degrees of arc, made by the mean flux transition line with a line normal to the
centreline of the recorded track.
4.7 back surface: The surface of the tape opposite to the magnetic coating which is used to record data.
4.8 bit cell: A distance along the track allocated for the recording of a Channel bit.
4.9 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 compressed data: Data which has been subjected to a compression algorithm.
4.13 Cyclic Redundancy Check (CRC) character: A 16-bit character obtained from a mathematical
calculation and used for error detection.
4.14 Data Format ID: An identifier specifying which data format is being used on the tape.
4.15 End of Data (EOD): The point on the tape at the end of the Frame which contains the last user data.
4.16 Error Correcting Code: A mathematical computation yielding check bytes used for the detection and cor-
rection of errors.
4.17 flux transition position: That point on a magnetic tape which exhibits the maximum free-space flux density
normal to the magnetic tape surface.
4.18 flux transition spacing: The distance along a track between successive flux transitions.
4.19 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.
4.20 Logical Beginning of Tape (LBOT):
The point along the length of the tape where a recording of data for
interchange commences.
4.21 Logical Record: Related data, from the host, treated as a unit of information.
4.22 magnetic tape: A tape which will accept and retain the magnetic signals intended for input, output and storage
purposes on computers and associated equipment.
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