ISO/IEC INTERNATIONAL STANDARD 15731 First edition 1998-05-15 Information technology 12,65 mm wide magnetic tape cassette for information interchange -- Helical scan recording DTF-1 format Technologies de I'information - Cassette de bande magnetique de balayage en spirale -Format DTF-1 Reference number ISO/IEC 15731:1998(E) Copyright Intermational Organization for Standardization mitted without license from IHS Not for Resale 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 2.3 Receiving system 1 3 Normative references 1 4 Definitions 2 4.1 Absolute block number 2 4.2 a.c. erase 2 4.3 algorithm 2 4.4 Append file 2 4.5 Append volume 22 4.6 Average Signal Amplitude (ASA) 4.7 azimuth 2 4.8 back surface 2 4.9 bit cell 22 4.10 block 4.11 Block Management Table (BMT) 2 4.12 byte 2 4.13 cassette 22 4.14 compressed data 4.15 Control Track 22 4.16 flux transition position 4.17 flux transition spacing 22 4.18 Logical track set ID 4.19 Logical volume 2222 4.20 magnetic tape 4.21 Master Standard Reference Tape (MSRT) 4.22 physical recording density @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 ISO/IEC Copyright Office · Case Postale 56 . CH-1211 Geneve 20. Switzerland Printed in Switzerland ii Copyright Intermational Organization for Standardization No reproduction or networking permitted without license from IHS Not for Resale @ ISO/IEC ISO/IEC 15731:1998 (E) 4.23 Reference Field (RF) 22 4.24 Secondary Standard Reference Tape (SSRT) 4.25StandardReferenceAmplitude (SRA) 2 4.26 Standard Reference Current (Ir) 33 4.27 Tape Reference Edge 4.28 Test Recording Current (TRC) 3 4.29 track 3 4.30 track angle 3 4.31 Track Set 3 4.32 Typical Field (TF) 3 4.33 Unique Identifier (UID) 3 4.34 word 3 5 Conventions and notations 3 5.1 Representation of numbers 3 5.2 Names 3 6 Acronyms 3 7 Environment and safety 4 7.1 Testing environment 4 7.2 Operating environment 4 7.3 Storage environment 4 7.4 Transportation 5 7.5 Safety 5 7.6 Flammability 5 Section 2 - Requirements for the case 5 8 Dimensional and mechanical characteristics of the case 5 8.1 General 5 8.2 Type S cassette 5 8.2.1 Overall dimensions 6 8.2.2 Holding areas 6 8.2.3 Window 6 8.2.4 Label areas 9 8.2.5 Datum areas and datum holes 7 8.2.6 Support areas 7 8.2.7 Guiding grooves 8 8.2.8 Recognition holes 9 8.2.9 Write-inhibit plug 10 8.2.10 Pre-positioning surface 11 8.2.11 Cassette lid 11 8.2.12 Cassette reel lock 12 8.2.13 Reel access holes 12 8.2.14 Reels 12 8.2.15 Position of the tape in the case 13 8.2.16 Tape path zone 14 ii CopyrightintermationalOrganizationfor Standardization No reproduction or networking permitted without license from IHS Not for Resale ISO/IEC ISO/IEC 15731:1998 (E) 14 8.2.17 Tape access cavity 29 8.3 Type L cassette 29 8.3.1 Overall dimensions 29 8.3.2 Holding areas 30 8.3.3 Window 30 8.3.4 Label areas 8.3.5 Datum areas and datum holes 30 30 8.3.6 Support areas 31 8.3.7 Guiding grooves 32 8.3.8 Recognition holes 33 8.3.9 Write-inhibit plug te 8.3.10 Pre-positioning surface te 8.3.11 Casselte lid 35 8.3.12 Cassette reel lock 35 8.3.13 Reel access holes 8.3.14 Reels 36 36 8.3.15 Position of the tape in the case 37 8.3.16 Tape path zone 85 8.3.17 Tape access cavity 38 8.3.18 Cavity for compatibility with Type S cassette Section 3 - Requirements for the unrecorded tape 53 9 Mechanical, physical and dimensional characteristics of the tape 53 53 9.1 Materials 54 9.2 Tape length 54 9.3Tape widths ts 9.4 Width and position of splicing tape 54 9.5 Discontinuity 9.6 Tape thickness 54 54 9.7 Longitudinal curvature 54 9.8 Out-of-plane distortions 55 9.9 Coating adhesion 55 9.10 Layer-to-layer adhesion 55 9.11 Tensile strength 55 9.11.1 Breaking strength 55 9.11.2 Yield strength 56 9.11.3 Strength of Splice 56 9.12 Residual elongation 56 9.13 Electrical resistance of the coated surfa