ISO/IEC INTERNATIONAL STANDARD 9661 Second edition 1994-12-15 Information technology Data interchange on 12,7 mm wide magnetic tape cartridges 18 tracks, 1 491 data bytes per millimetre Technologies de I'information --- Echange de données sur cartouches de bande magnetique de 12.7 mm de large — 18 pistes, 1491 caracteres parmillimetre IEC Reference number ISO/IEC 9661:1994(E) Copyright Intermational Organization for Standardization rovided by IHS ense with rmitted without license from IHS Not for Resale ISO/IEC 9661:1994 (E) Contents Page Section 1 - General 1 1 Scope 1 2 Conformance 1 3 Normative references 1 4 Definitions 1 4.1 Average signal amplitude 1 4.2 Back surface 1 4.3 Beginning of Tape (BOT) 1 4.4 Byte 1 4.5 Cartridge 1 4.6 Cyclic RedundancyCheckcharacter 1 4.7 Data density 1 4.8 Error Correcting Code 1 4.9 Flux transition position 1 4.10 Flux transition spacing 2 4.11 Magnetic tape 2 4.12 Master Standard Reference Tape 2 4.13 Physical recording density 2 4.14 Postamble 2 4.15 Preamble 2 4.16 Reference field 2 4.17 Secondary Standard Reference Tape 2 4.18 Standard reference amplitude 2 4.19 Standard reference current 2 4.20 Test recording current 2 4.21 Track 2 4.22 Typical field 2 5 Environment and safety 2 5.1 Cartridge/Tape testing environment 2 5.2 Cartridge operation environment 2 5.3 Cartridge storage environment 3 5.4 Safety requirements 3 ?ISO/IEC1994 All rights reserved. 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 per- mission in writing from the publisher Printed in Switzerland ii Copyright Internatic ional Organization for Standardization No reproduction or networking permited without license from IHS Not for Resale ISO/IEC 9661:1994 (E) 5.4.1 Safety 3 5.4.2 Flammability 3 5.5 Transportation 3 Section 2 - Tape requirements 3 9 Characteristics of the tape 3 6.1 Material 3 6.2 Tape length 3 6.3 Tape width 3 6.4 Tape discontinuity 3 6.5 Total thickness of tape 3 6.6 Base material thickness 3 6.7 Longitudinal curvature 3 6.8 Out-of-plane distortions 4 6.9 Cupping 4 6.10 Dynamic frictional characteristics 4 6.10.1 Frictional drag between the recording surface and the tape back surface 4 6.10.2 Frictional drag between the tape recording surface and ferrite after environmental cycling 4 6.11 Coating adhesion 5 6.12 Flexural rigidity 6 6.13 Electrical resistance of coated surfaces 6 6.14 Tape durability 7 6.15 Inhibitor tape 7 6.16 7 Tape abrasivity 6.17 Pre-recording condition 7 6.18 Magnetic recording characteristics 8 6.18.1 Typical field 80 6.18.2 Signal amplitude 8 6.18.3 Resolution 8 6.18.4 Overwrite 8 6.18.5 Narrow-Band Signal-to-Noise Ratio (NB-SNR) 9 6.19 Tape quality 9 6.19.1 Missing pulses 10 6.19.2 Missing puise zones 10 6.19.3 Coincident missing pulse zones 10 Section 3 - Cartridge requirements 10 1 Dimensional and mechanical characteristics of the cartridge 10 7.1 Overall dimensions (figures 4 to 6) 11 7.2 Write-inhibit mechanism (figures 4 and 5) 11 7.3 Label area of the rear side (figures 5 and 6) 11 7.4 Label area of the top side (figure 5) 12 7.5 Case opening (figures 4, 5, 7 and 9) 12 7.6 Locating notches (figures 7, 8 and 10) 12 7.7 Locating areas (figure 7) 13 7.8 Inside configuration of the case around the case opening (figures 7 and 11) 13 7.9 Other external dimensions of the case (figure 8) 13 7.10 Central window (figure 7) 13 7.11 Stacking ribs 13 7.12 Flexibility of the case 14 14 7.12.1 Requirements iii zation for Standardization Noreproductionornetworkingpermited without licensefromHS Not for Resale