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INTERNATIONAL STANDARD

IISO/IEC 11321

First edition 1992-12-15

Information technology - 3,81 mm wide magnetic tape cartridge for information interchange - Helical scan recording - DATA/DAT format

Technologies de I’informa tion - Cartouche de bande magnetique de 3,81 mm de /arge pour Mchange d’information - Enregistrement h6licoidal - Format DATA/DAT

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= = E E g = z s c S s X - - -- - Y - P Reference number

ISO/IEC 11321 :1992(E)

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ISO/IEC 11321:1992 (E)

Contents

Section 1 : General

1 Scope

2 Conformance

2.1 Magnetit tape cartridge 2.2 Generating System 2.3 Receiving System

3 Normative references

4 Definitions

4.1 Absolute Frame Number (AFN) 4.2 AC erase 4.3 Area ID 4.4 Automatic Track Finding (ATF) 4.5 Average Signal Amplitude 4.6 azimuth 4.7 back surface 4.8 byte 4.9 cartridge 4.10 Channel bit 4.11 Data Format ID 4.12 End of Data (EOD) 4.13 End of Information (EOI) 4.14 End of Partition (EOP) 4.15 Error Correcting Code (ECC) 4.16 flux transition Position

o ISO/IEC 1992 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronie or mechanical, including photocopying and microfilm, without per- mission in writing from the publisher.

I SO/I EC Copyright Office l Case Postale 56 l CH-l 211 Geneve 20 l Switzerland Printed in Switzerland

ii



ISO/IEC 11321:1992 (E)

l 4.17 4.18 4.19 4.20 4.21 4.22 4.23 4.24 4.25 4.26 4.27 4.28 4.29 4.30 4.31 4.32 4.33 4.34 4.35 4.36 4.37 4.38 4.39 4.40 4.41

flux transition spacing frame gro u p

Logical Reginning of Tape (IBOT) Logical End of Tape (LEOT) magnetic tape Master r-eference Master Standard Amplitude Calibration Tape Master Standard Reference Tape Optimum recording field partition partition reference Physical ßeginning of Tape (PRO’T’) Phvsic;ll End of Tape (PEOT) M physical recording density pre-recording condition (maximum recorded levels) r-em rd Reference Recording Field Secondary Standard Amplitude (Xibration Tape Secondary Standard Reference Tape sepa i-3 tor Standard Reference Amplitude tape nclise amplitude Tape Reference Edge track

2 2 2 2 2 2 2 2 2 2 2 3 3 3 3 3 3 3 3 3 3 3 3 3 3

5 Environment and safety 3

5.1 Testing environment 5.2 Operating environment 5.3 Storage environment 5.4 Transportation 5.5 Safety 5.6 Flammability

3 3 4 4 4 4

Section 2 : Requirements for the case

6 Dimensional and mechanical characteristics of the case

6.1 6.2 6.3 6.4 6.5 6.6 6.7 6.8

General Overall dimensions (figures 6 ;rnd 7) l.,oading grip (figure 6) Holding areas (figure 6) Notches of the lid (figures 5 and 8) Lid dimensions (figures 6 to 8) 0ptic;tl detection of the beginning ;tncl end of tape (figure 9 and 12) Bottom side (figures IO ;~nd 1 1)

6.8.1 6.8.2 6.8.3 6.8.4

Locking mech;rnism of the sliclcr Access holes Recognition. subd:ltum mtl write-inhibit holes Dr1 t 11 m hob

7 8 8

10

. . . Ill



ISO/IEC 11321:1992 (E)

6.8.5 Access room for tape guides 6.8.6 Holes for accessing the hubs 6.8.7 Internal structure of the lower half (figure 12) 6.8.8 Light path (figure 12) 6.8.9 Support areas (figure 13) 6.8.10 Datum areas (figure 13) 6.8.11 Relationship between support and Datum Areas and Reference Plane 2 (figure 14)

6.9 Hubs (figures 15, 16) 6.10 Leader and trailer attachment 6.11 Interface between the hubs and the drive spindles (figure 17) 6.12 Opening of the lid (figure 18) 6.13 Release of the hub locking mechanism (figures 19, 20) 6.14 Label area (figures 21, 22)

Section 3 : Requirements for the unrecorded tape

7 Mechanical, physical and dimensional characteristics of the tape

7.1 Materials 7.2 Tape iength

7.2.1 Length of mngnetic tnpe 7.2.2 Length of leader and trailer tnpes

7.3 Tape width 7.4 Discontinuities 7.5 Total thickness 7.6 l L,ongitudinni curvature 7.7 Cupping 7.8 Co;\ ti ng ad hesion 7.9 Layer-to-layer adhesion 7.10 Tensile strength

7.10.1 Breaking strength 7.10.2 Y ield strength

7.11 Residual elongation 7.12 Electrical resistance of coated surfaces 7.13 Light transmittance of tape

8 Magnetit recording characteristics

8.1 Optimum recording field 8.2 Signal Amplitude 8.3 Resolution 8.4 Overwrite

8.4.1 Physical Recording Densities of 750,h and 3 002 ftpmm 8.4.2 Physical recording densities of 83,4 ftpmm and 1 001 ftpmm

8.5 Ease of erasure 8.6 Tape quality

10 11 11 12 12 12 13

13 13 13 14 14 14

25

25

25 25

25 25

25 25 25 25 25 26 26 26

26 26

27 27 28

28

28 28 29 29

29 29

30 30

8.6.1 Missing pulses 30

8.6.2 Missing pulse Zone 30



ISO/IEC 11321:1992 (E)

8.7 Signal-to-noise ratio (S/N) charncteristic 30

Section 4 : Format 30

9 DATA/DAT formst 30

9.1 9.2

Genera 1 Basic G rou ps

Basic Groups for Group Format 0 Basic Groups for Group Format 1

Sub-Groups

G 1 Sub-group G2 Sub-group G3 Sub-group G4 Sub-gmup

Main Data Block

30 31

9.2.1 9.2.2

31 32

9.3 33

9.3.1 9.3.2 9.3.3 9.3.4 9.3.5

33 34 34 35 40

9.4 Sub-Data area 42

9.4.1 Pack Item No. I 42

9.4.2 Pack Item No. 2 43

9.4.3 Pack ltem No. 3 45



9.4.6 Pack ltem No. 6 48


9.4.8 Sub Data Block 49

9.5

9.51 9.5.2 9.5.3 9.5.4

Basic Group structure

User Data

51

System Data Record 1 I-1 list 1 Ieuristic Recovery Data AI-e;]

52 52 56 60

10 Method 01‘ recording 60

10.1 10.2 10.3 10.4 10.5 10.6 10.7

Physical recording density Lang-Term average bit cell lengt h Short-Term average bit cell length Rate of change Bit shift Read Signal amplitude Maximum recorded levels

60 60 60 60 60 60 60

11 Track geomet ry 60

11.1 Track configuration 11.2 Average track pitch 11.3 Variations of the track pitch 11.4 Track width 11.5 Trat k angle 11.6 Track edge Iinearity

60 61 61 61 62 62



ISO/IEC 11321:1992 (E)

11.7 Track lengt h 11.8 Ideal tape centreline 11.9 Azimuth angles

12 Recording of blocks on the tape

12.1 Recorded Main Data Block 12.2 Recorded Sub Data Block 12.3 Margin Blocks, Preamble Blocks and Postnmblc Blocks 12.4 Spacer Blocks

13

13.1 13.2 13.3

Format of a track 62

Track capacity Positioning accurncy Tracking scheme

14 Group Formats

14.1 Group Format 0 14.2 Group Format 1 14.3 Extended Gap Frames

14.3.1 Extended 1 -eading Gap Frames 14.3.2 Extended Trailing Gap Frames

14.4 Types of Groups

14.4.1 Normal Groups 13.4.2 Spare Groups 14.4.3 Amhle Grwps

15

15.1 15.2

15.2.1 15.2.2 15.2.3 15.2.4 15.2.5

15.3

15.3.1 15.3.2 15.3.3 15.3.4 15.3.5 15.3.6

15.4 15.5 15.6 15.7

Magnetit tape layout

Load/U nload Area Lead-in Area

Preamble Meader Format Parameter Set Master Reference Postamble

Partition 84

Partition Preamble 84 Partition Reference 84 Partition Postamble 96 Partition Data 96 End of Partition (EOP) 97 Unused Area 97

EO1 Repeated Groups Repeated Frames within a Normal Group Relocation of Defect ive G t-OLIIX

62 62 62

62

62 62 62 62

62 63 63

66

66 66 67

67 67

67

68 68 68

69

69 70

70 70 72 77 83

97 97 98 98



ISO/IEC 11321:1992 (E)

15.8 Appending 98

15.8.1 Semtless appending 15.8.2 Non-semmless appending

15.9 Ova-wt-i te (figu t-e 83)

15.9.1 OW-lapped tt-ack width 15.9.2 Non-ovet-lnpped track width 15.9.3 Rules fm- ovet-write

Annexes

A

n

c

D

E

F

G

H

J

K

L

M

Measurement of the light transmittance of the prisms 103

Recogn i t ion Holes 105

Means for opening the lid

Measurement of light transmiltance of tape and leaders

Mcasurement of Signal-to-Noise Ratio

Method for determining the nominal and the maximum allowable recorded levels

Representation of g-bit bytes by 10.bit Pattern

Measurement of bit shift

106

107

110

111

112

118

Recommendations for transportat ion

Method of measuring track edge linearity

121

122

Read-After-Write 123

Data allocation and C3 parity 124

99 100

101

102 102 102

vii



ISO/IEC 11321:1992 (E)

Foreword ISO (the International Organization for Stnndardization) and IEC (the International Eiectrotechnicai 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 estabiished by the respective organization to deal with particuiar fieids of technical activity. ISO and IEC technicai committees collaborate in fieids of mutual interest. Other international organizations, governmental and non- governmentai, 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 JTCl. Draft International Standards adopted by the joint aechnical committee at-e circulated to national bodies for voting. Publication as an International Standard requires npproval by at least 75 a/o of the national bodies casting a vote.

International Standard ISO/IEC % 1,321 was prepared by the European Computer Manufacturers Association (as Standard ECMA-146) and was adopted, under a special “fast-track procedure”, by Joint Technical Committee lSO/IEC JTCI, Infi>rn&on tc&z&qy, in parallel with its approval by national bodies of ISO and IEC.

Annexes A, D, E, F, (3, I-l, K and M form an integral part of this International Standard. Annexes B, C, J and L are for information only.

Patents

During the prepnration of the ECMA Standard, information was gathered on Patents upon which application of the Standard might depend. Relevant Patterns were identified as belonging to Hitschi and the Sony Cvrporation. However, neither ECMA nor ISO/IEC tan give authoritative or comprehensive information about evidente, validity or scope of patent and like rights. The patent hoiders have stated that licences will be granted under reasonabie and non-discriminatory terms. Communications on this subject shouid be addressed to

Hitschi, Ltd. European Operation Centre Wallhrook Busi ness Centre G reen 1 *a ne Hounslow TW3 hN W United Kingdom

Sony Corporafion Licensing and Tradema i-k Division h-7-3 Kitashinagawa Shinagawa-ku Tokyo 131 Japan

. . . Vlll



INTERNATIONAL STANDARD ISO/IEC 11321:1992 (E)

Information technology - 341 mm wide magnetic tape cartridge for information interchange - Helical scan recording - DATA/DAT format

Section 1 : General

1 Scope This International Standard specifies the physical and magnetic characteristics of a 3,8i mm wide magnetic tape cartridge to enable interchangeability of such cartridges. It also specifies the quaiity of the recorded Signals, and the formal and recording method, thereby allowing data interchange by means of such magnetic tape cartridges.

2 Conformance 2.1 Magnetit tape cartridge

A tape cartridge shall be in conformance with this International Standard if it meets all mandatory requirements specified herein. The tape requirements shail be satisfied throughout the extent of the tape.

2.2 Generating System

A System generating ;1 magnetic tape cartridge for interchange shail be entitled to Claim conformance to this international Stand;u-d if all recordings on the tape meet the mandatory requirements of this International Standard.

2.3 Receiving System

A system receiving ;i mngnetic tape cartridge for interchange shail be entitied to Claim conformance with this International Str~ndar-d if it is able to handle any recording made on the tape according to this International Standard.

3 Normative Keferences 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 vaiid. 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 iisted beiow. Members of IEC and ISO maintain registers of currently vaiid International Standards.

ISO/R 527: 1966, I’lusiics - Determination of tensile properties

ISO/IEC 646: 199 1, Information technology - ISO 7-bit coded Character set for information interchange.

ISO 1302: 1978, Technical Drawings - Method of indicating surface texture on drawings

1 EC 950: 1990, Safety of Information Technology Eyuipment, including Electrical Business Eyuipmenr

4 Definitions For the purpose of this International Standard, the foiiowing definitions appiy.

4.1 Absolute Frame Number (AFN): A sequence number aiiocated to, and recorded in, each frame.

4.2 AC erase: A process of erasure utilizing alternating fieids of decaying ievei.

4.3 Area ID: An identifier for each area of the tape specifying the types of frame written therein.

4.4 Automatic Track Finding (ATF): A method by which tracking is achieved.



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