INTERNATIONAL ISO/IEC STANDARD 15521 First edition 1998-06-01 Information technology 3,81 mm wide magnetic tape cartridge for information interchange -- Helical scan recording DDS-3 format using 125 m length tapes Technologies de l'information - Cartouche de bande magnetique de 3,81 mm de large pour I'échange d'information - Enregistrement par balayage en spirale - Format DDS-3 utilisant des bandes de 125 m de long IEC ISO Reference number ISO/IEC 15521:1998(E) Copyright Intermational Organization for Standardization Not for Resale ISO/IEC 15521:1998(E) Contents 1 Scope 1 1 2 Conformance 1 2.1 Magnetic tape cartridge 2.2 Generating drive 1 2.3 Receiving drive 1 3 Normative References 2 2 4 Definitions 2 4.1 Absolute Frame Number (AFN) 2222222222233333 4.2 a.c. erase 4.3 Access Point 4.4 algorithm 4.5AreaID 4.6 Average Signal Amplitude 4.7azimuth 4.8 back surface 4.9 byte 4.10 cartridge 4.11 Channel bit 4.12Codeword 4.13 Data Format ID 4.14 Early Warning Point (EWP) 4.15 End of Data (EOD) 4.16 Entity 4.17 Error Correcting Code (ECC) 4.18 flux transition position 3 4.19 flux transition spacing 3 4.20 Fragment 3 4.21 Frame 3 3 4.22 Housekeeping Frame 4.23 Logical Beginning of Tape (LBOT) 3 33 4.24 magnetic tape 4.25MasterStandardAmplitudeCalibrationTape 4.26 Master Standard Reference Tape 3 4.27 Optimum Recording Field 3 4.28 Partition Boundary 3 4.29 Physical Beginning of Tape (PBOT) 33 4.30 Physical End of Tape (PEOT) 4.31 physical recording density 3 4.32 pre-recording condition 3３ 4.33 processing 4.34 processed data 33 4.35 Processed Record 4.36 Processed Record Sequence 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 publisher. ISO/IEC Copyright Office · Case postale 56 · CH-1211 Geneve 20 · Switzerland Printed in Switzerland ii nitted without license from IHS Not for Resale @ISO/IEC ISO/IEC15521:1998(E) 4.37 record 33 4.38 Reference Recording Field 4.39 reprocessing 4 4.40 Secondary Standard Amplitude Calibration Tape 4 4.41 Secondary Standard Reference Tape 4 4.42 Separator Mark 4 4.43 Standard Reference Amplitude 4 4.44 Tape Reference Edge 4 4.45 Test Recording Current 4 4.46track 4 4.47 unprocessed data 4 4.48 Unprocessed Record 4 4.49 Virtual End of Tape (VEOT) 4 5 Conventions and Notations 4 6 Acronyms 4 7 Environment and safety 5 7.1 Testing environment 5 7.2 Operating environment 5 7.3 Storage environment 5 7.4 Transportation 5 7.5 Safety 55 7.6 Flammability 8 Dimensional and mechanical characteristics of the case 6 8.1 General 6 8.2 Overall dimensions 6 8.3 Loading grip 7 8.4 Holding areas 7 8.5 Notches of the lid 7 8.6Liddimensions 7 8.7 Optical detection of the beginning and end of tape 8 8.8 Bottom side 8 8.8.1 Locking mechanism of the slider 9 8.8.2 Access holes 9 8.8.3 Recognition, sub-datums, and write-inhibit holes 9 8.8.4 Datum holes 11 8.8.5 Access room for tape guides 11 8.8.6 Holes for accessing the hubs 11 8.8.7 Internal structure of the lower half 12 8.8.8 Light path 13 8.8.9 Support Areas 13 8.8.10 Datum Areas 13 8.8.11 Relationship between Support and Datum Areas and Reference Plane Z 13 8.9 Hubs 13 8.10 Attachment of leader and trailer tapes 14 8.l1Interfacebetweenthehubs andthedrive spindles 14 8.12 Opening of the lid 14 8.13 Release of the hub locking mechanism 14 8.14 Label areas 15 8.15 Requirement for autoloaders 15 9 Mechanical, physical and dimensional characteristics of the tape 27 ili Not for Resale @ISO/IEC ISO/IEC 15521:1998(E) 27 9.1 Materials 27 9.2 Tape length 27 9.2.1 Length of magnetic tape 27 9.2.2 Length of leader and trailer tapes 27 9.2.3 Length of splicing tapes 27 9.3 Tape width 27 9.3.1 Width of magnetic tape 27 9.3.2 Width of leader and trailer tapes 27 9.3.3 Width and position of splicing tape 27 9.3.4 Edge weave 29 9.4 Discontinuities 29 9.5 Tape thickness 29 9:5.1 Thickness of magnetic tape 29 9.5.2 Thickness of leader and trailer tape 9.5.3 Thickness of splicing tape 29 29 9.6