ISO/IEC INTERNATIONAL STANDARD 13923 First edition 1996-12-15 Information technology -- 3,81 mm wide magnetic tape cartridge for information interchange - Helical scan recording -- DDS-2 format using 120 m length tape Technologies de I'information-- -- Cartouche de bande magnétique de balayage en spirale - Format DDS-2 utilisant une bande de 120 m de long Ts 0 Reference number ISO/IEC13923:1996(E) Copyright Intermational Organization for Standardization Not for Resale ISO/IEC 13923:1996(E) Contents Page Section 1 - General 1 Scope 1 2 Conformance 1 2.1 Magnetic tape cartridge 1 2.2 Generating system 1 2.3 Receiving system 2 3 Normative References 2 4 Definitions 2 4.1 Absolute Frame Number (AFN) 2 4.2 a.c. erase 2 4.3 Access Point 2 4.4 Algorithm 2 4.5 Area ID 2 4.6 Automatic Track Finding (ATF) 2 4.7 Average Signal Amplitude 3 4.8 azimuth 3 4.9 back surface 3 4.10 byte 3 4.11 cartridge 3 4.12 Channel Bit 3 4.13 Codeword 3 4.14 Data Format ID 3 4.15 Early Warning Point (EWP) 3 4.16 End of Data (EOD) 3 4.17 Entity 3 4.18 Error Correcting Code (ECC) 3 4.19 flux transition position 3 4.20 flux transition spacing 3 4.21 Frame 3 4.22 Housekeeping Frame 3 4.23 Logical Beginning of Tape (LBOT) 3 4.24 magnetic tape 3 ISO/IEC1996 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 Geneve 20 · Switzerland Printed in Switzerland king permited without license from IHS Not for Resale ISO/IEC 13923:1996(E) @ ISO/IEC 4.25 Master Standard Amplitude Calibration Tape 3 4.26 Master Standard Reference Tape 4 4.27 Optimum Recording Field 4 4.28 Partition Boundary 4 4.29 Physical Beginning of Tape (PBOT) 4 4.30 Physical End of Tape (PEOT) 4 4.31 physical recording density 4 4.32 pre-recording condition 4 4.33 processing 4 4.34 processed data 4 4.35 Processed Record 4 4.36 Processed Record Sequence 4 4.37 record 4 4.38 Reference Recording Field 4 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 5 4.45 Test Recording Current 5 4.46 track 5 4.47 unprocessed data 5 4.48 Unprocessed Record 5 4.49 Virtual End of Tape (VEOT) 5 5 Environment and safety 5 5.1 Testing environment 5 5.2 Operating environment 5 5.3 Storage environment 5 5.4 Transportation 5 5.5 Safety 6 5.6 Flammability 6 Section 2 - Requirements for the case 6 Dimensional and mechanical characteristics of the case 7 6.1 General 7 6.2 Overall dimensions 7 6.3 Loading grip 8 6.4 Holding areas 8 6.5 Notches of the lid 8 6.6 Lid dimensions 8 6.7 Optical detection of the beginning and end of tape 9 6.8 Bottom side 9 6.8.1 Locking mechanism of the slider 10 6.8.2 Access holes 10 6.8.3 Recognition, write-inhibit and sub-datums holes 10 6.8.4 Datum holes 12 6.8.5 Access room for tape guides 12 6.8.6 Holes for accessing the hubs 12 6.8.7 Internal structure of the lower half 13 6.8.8 Light path 14 6.8.9 Support Areas 14 6.8.10 Datum Areas 14 6.8.11 Relationship between Support and Datum Areas and Reference Plane Z 14 ili on or networking permitted without license from IHS Not for Resale @ISO/IEC ISO/IEC 13923:1996(E) 6.9 Hubs 14 6.10 Attachment of leader and trailer tapes 15 6.11 Interface between the hubs and the drive spindles 15 6.12 Opening of the lid 15 6.13 Release of the hub locking mechanism 15 6.14 Label areas 16 6.15 Requirement for autoloaders 16 Section 3 - Requirements for the unrecorded tape 7 Mechanical, physical and dimensional characteristics of the tape 28 7.1 Materials 28 7.2 Tape length 28 7.2.1 Length of magnetic tape 28 7.2.2 Length of leader and trailer tapes 28 7.2.3 Length of splicing tapes 28 7.3 Tape width 28 7.3.1 Width of magnetic, leader and trailer tapes 28 7.3.2 Width and posit