ISO IEC 15731-1998 Information technology - 12 65 mm wide magnetic tape cassette for information interchange - Helical scan recording - DTF-1 format《信息技术 信息交换用1.pdf
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1、INTERNATIONAL STANDARD lSO/IEC 15731 First edition 1998-05-l 5 Information technology - 12,65 mm wide magnetic tape cassette for information interchange - Helical scan recording - DTF-1 format Technologies de /information - Cassette de bande magktique de 12,65 mm de large pour kchange dinformation -
2、 Enregistrement par balayage en spirale - Format DTF- 1 Reference number ISO/IEC 15731:1998(E) ISO/IEC 15731:1998 (E) Contents Section 1 - General 1 1 Scope 1 2 Conformance 1 2.1 Magnetic tape cassette 1 2.2 Generating system 1 2.3 Receiving system 1 3 Normative references 1 4 Definitions 4.1 Absolu
3、te block number 4.2 a.c. erase 4.3 algorithm 4.4 Append file 4.5 Append volume 4.6 Average Signal Amplitude (ASA) 4.7 azimuth 4.8 back surface 4.9 bit cell 4.10 block 4.11 Block Management Table (BMT) 4.12 byte 4.13 cassette 4.14 compressed data 4.15 Control Track 4.16 flux transition position 4.17
4、flux transition spacing 4.18 Logical track set ID 4.19 Logical volume 4.20 magnetic tape 4.21 Master Standard Reference Tape (MSRT) 4.22 physical recording density 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 0 ISO/IEC 1998 All rights reserved. Unless otherwise specified, no part of this publicatio
5、n 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. ISOllEC Copyright Office l Case Postale 56 l CH-1211 Geneve 20 l Switzerland Printed in Switzerland ii 0 ISO/IEC ISO/IEC 1573
6、1:1998 (E) 4.23 Reference Field (RF) 4.24 Secondary Standard Reference Tape (SSRT) 4.25 Standard Reference Amplitude (SRA) 4.26 Standard Reference Current (Ir) 4.27 Tape Reference Edge 4.28 Test Recording Current (TRC) 4.29 track 4.30 track angle 4.31 Track Set 4.32 Typical Field (TF) 4.33 Unique Id
7、entifier (UID) 4.34 word 5 Conventions and notations 5.1 Representation of numbers 5.2 Names 6 Acronyms 7 Environment and safety 7.1 Testing environment 7.2 Operating environment 7.3 Storage environment 7.4 Transportation 7.5 Safety 7.6 Flammability Section 2 - Requirements for the case 8 Dimensiona
8、l and mechanical characteristics of the case 8.1 General 8.2 Type S cassette 8.2.1 Overall dimensions 8.2.2 Holding areas 8.2.3 Window 8.2.4 Label areas 8.2.5 Datum areas and datum holes 8.2.6 Support areas 8.2.7 Guiding grooves 8.2.8 Recognition holes 8.2.9 Write-inhibit plug 8.2.10 Pre-positioning
9、 surface 8.2.11 Cassette lid 8.2.12 Cassette reel lock 8.2.13 Reel access holes 8.2.14 Reels 8.2.15 Position of the tape in the case 8.2.16 Tape path zone 2 2 2 3 3 3 3 3 3 3 3 3 3 3 3 5 5 5 6 6 6 6 7 7 8 9 10 11 11 12 12 12 13 14 . . . 111 ISO/IEC 15731:1998 (E) 0 lSO/lEC 8.2.17 Tape access cavity
10、8.3 Type L cassette 8.3.1 Overall dimensions 8.3.2 Holding areas 8.3.3 Window 8.3.4 Label areas 8.3.5 Datum areas and datum holes 8.3.6 Support areas 8.3.7 Guiding grooves 8.3.8 Recognition holes 8.3.9 Write-inhibit plug 8.3.10 Pre-positioning surface 8.3.11 Cassette lid 8.3.12 Cassette reel lock 8.
11、3.13 Reel access holes 8.3.14 Reels 8.3.15 Position of the tape in the case 8.3.16 Tape path zone 8.3.17 Tape access cavity 8.3.18 Cavity for compatibility with Type S cassette Section 3 - Requirements for the unrecorded tape 9 Mechanical, physical and dimensional characteristics of the tape 9.1 Mat
12、erials 9.2 Tape length 9.3 Tape widths 9.4 Width and position of splicing tape 9.5 Discontinuity 9.6 Tape thickness 9.7 Longitudinal curvature 9.8 Out-of-plane distortions 9.9 Coating adhesion 9.10 Layer-to-layer adhesion 9.11 Tensile strength 9.11.1 Breaking strength 9.11.2 Yield strength 9.11.3 St
13、rength of Splice 9.12 Residual elongation 9.13 Electrical resistance of the coated surfaces 9.14 Tape wind 10 Magnetic recording characteristics 10.1 Typical Field TFI 10.2 Average Signal Amplitude(ASA) 10.3 Resolution 10.4 Signal-to-noise ratio (S/N) 14 29 29 29 30 30 30 30 31 32 33 34 34 35 35 36
14、36 37 38 38 53 53 53 54 54 54 54 54 54 54 55 55 55 55 55 56 56 56 56 56 57 57 57 57 iv 0 ISO/IEC ISO/IEC 15731:1998 (E) 10.5 Ease of erasure 10.6 Tape quality 10.6.1 Missing pulses 10.6.2 Missing pulse zone 10.7 Inhibitor tape Section 4 - Requirements for an interchanged tape 11 Format for helical t
15、racks 11.1 General description of the write data path 11.2 Formation of a Logical Track Set 11.2.1 Types of information track sets 11.2.2 Generation of a Logical Track Set 11.2.3 Subcode data field 11.2.4 BMT 11.2.5 Data and information field definitions 11.3 Track Set information 11.3.1 Loading the
16、 Product Code Arrays 11.4 Product code array processing 11.4.1 Error correction method 11.4.2 Error correction coding for Cl Parity 11.5 Track assignments 11.5.1 Sectors 11.5.2 Sync Blocks 11.5.3 Track interleave 11.5.4 Track Sync Blocks 11.5.5 Byte interleave across Sync Blocks 11.5.6 Randomization
17、 11.6 Formation of the contents of a helical track 11.6.1 Sector details (figure 50) 11.7 Channel bit coding (annex B) 11.7.1 General 11.7.2 Interleaved-NRZI 12 Track geometry 12.1 General 12.2 Helically recorded tracks 12.2.1 Location of the tracks 12.2.2 Track width 12.2.3 Track angle 12.2.4 Track
18、 pitch 12.2.5 Location of elements in the helical track 12.2.6 Location of the Data Area Reference Point 12.2.7 Straightness of tracks 12.2.8 Azimuth angles 12.2.9 Tracking Pilot Signal (TPS) 57 57 57 58 58 59 59 59 59 59 61 63 64 65 69 69 71 71 71 73 73 73 74 75 76 76 77 77 79 79 79 79 79 79 79 80
19、80 80 81 81 81 81 81 V ISO/IEC 15731:1998 (E) 0 ISO/IEC 12.2.10 Amplitude of servo signals 12.3 Longitudinal tracks geometry 12.3.1 Control Track 12.3.2 Time Code Track signals recording position 13 Method of recording helical tracks 82 13.1 Physical recording density 82 13.2 Record current optimiza
20、tion 82 13.3 Efficiency of erasure 82 14 Method of recording longitudinal tracks 14.1 Overview 14.2 Control Track 14.2.1 Signal 14.2.2 Polarity of magnetisation (figure 53) 14.2.3 Alignment 14.2.4 Read signal amplitude 14.2.5 Quality of the Control Track 14.3 Time Code Track 14.3.1 Method of recordi
21、ng the Time Code Track 14.3.2 Physical recording density 14.3.3 Bit shift 14.3.4 Read signal amplitude 14.3.5 Quality of the Time Code Track 14.4 Format for the Time Code Track 14.4.1 Count bits 14.4.2 Phase bit 14.4.3 Synchronizing pattern 14.4.4 Supplemental Data 14.4.5 Extent of Time Code Section
22、 5 - Requirements for recorded information 84 15 Recorded information 15.1 Recording area (figure 54) 15.2 Magnetic tape layout (figure 55) 15.2.1 Valid data areas 15.2.2 Invalid data areas 15.3 Physical TSID 15.3.1 Structure surrounding the VSIT area 15.3.2 Structure of the DIT area 15.3.3 Structur
23、e of the User Data Area 81 81 81 82 82 82 82 82 82 82 83 83 83 83 83 83 84 84 84 84 84 84 84 84 84 84 85 85 85 85 87 87 88 Section 6 - Write operations 89 16 Write retry sequence 89 vi 0 ISO/IEC 17 Append file operation 89 17.1 Append volume 89 17.2 Append write 90 17.3 Overwrite 90 17.4 File extens
24、ion 91 Annexes A - Measurement of Signal-to-Noise Ratio B - Representation 819 coding patterns C - Recommendations for Transportation D - Inhibitor Tape ISO/IEC 15731:1998 (E) 93 94 98 99 vii ISOilEC 15731:1998 (E) 0 ISO/IEC Foreword IS0 (the International Organization for Standardization) and IEC (
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