ISO/IEC INTERNATIONAL STANDARD 12246 First edition 1993-12-15 Information technology --- 8 mm wide magnetic tape cartridge dual azimuth format for information interchange Helical scan recording Technologies de I'information --- Cartouche de bande magnetique de 8mm delarge de format double azimut pour I'échange d'information-Enregistrementparbalayage en spirale IEC ISO Reference number ISO/EC 12246:1993(E) Copyright Intermational Organization for Standardization rovided byIHS mitted without license from IHS Not for Resale ISO/IEC 12246:1993 (E) Contents Page Section 1 - General 1 1 Scope 1 2 Conformance 1 3 Normative references 1 4 Definitions 1 4.1 a.c. erase 1 4.2 algorithm 1 4.3 Average Signal Amplitude 1 4.4 azimuth 2 4.5 back surface 2 4.6 bit cell 2 4.7 byte 2 4.8 cartridge 2 4.9 compressed data 2 4.10 Cyclic Redundancy Check (CRC) Character 2 4.11 Error Correcting Code (ECC) 2 4.12 flux transition position 2 4.13 flux transition spacing 2 4.14 logical record 2 4.15 magnetic tape 2 4.16 Master Standard Reference Tape 2 4.17 Physical Beginning of Tape (PBOT) 2 4.18 Physical End of Tape (PEOT) 2 4.19 physical recording density 2 4.20 Secondary Reference Amplitude 2 4.21 Secondary Reference Field 2 4.22 Secondary Standard Reference Tape 2 ISO/IEC 1993 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 CoyrhematinalgizatiSandardizai No reproductic ermitted without license from IHS Not for Resale ISO/IEC 12246:1993 (E) 4.23 Standard Reference Current 2 2 4.24 Tape Reference Edge 4.25 Test Recording Current 2 4.26 track 2 4.27 2 Typical Field 4.28 uncompressed data 2 Environment and safety 3 5 5.1 Testing environment 3 5.2 Operating environment 3 5.3 Storage environment 3 5.4 Transportation 3 5.5 Safety 3 5.6 Flammability 3 Section 2 - Cartridge 4 Dimensional and mechanical characteristics of the cartridge 4 6 6.1 General 4 6.2 Overall dimensions 4 6.3 4 Holding areas 6.4 Cartridge insertion 6.5 Window 5 6.6 Loading grips 5 6.7 Label areas 6 6.8 Datum areas and datum holes 6 6.9 Support areas 7 6.10 Recognition holes 7 6.11 Write-inhibit hole 8 6.12 Pre-positioning surfaces 8 6.13 Cartridge lid 9 6.14 Cartridge reel lock 10 6.15 Reel access holes 11 6.16 Interface between the reels and the drive spindles 11 6.17 Light path 12 Position of the tape in the case 12 6.18 6.19 Tape path zone 12 6.20 Tape access cavity 13 6.21 Tape access cavity clearance requirements 13 Section 3 - Requirements for the unrecorded tape 30 7 Mechanical, physical and dimensional characteristics of the tape 30 7.1 Materials 7.2 Tape length 30 7.2.1 Magnetic tape 7.2.2 Leader and trailer tapes 30 7.2.3 Splicing tape 30 iii rmitted without license from IHS Not for Resale