ISO/IEC INTERNATIONAL STANDARD 13421 First edition 1993-12-15 Information technology Data interchange on 12,7 mm, 48-track magnetic tape cartridges DLT 1 format Technologies de I'information - Echange de données sur cartouches pour bandes magnetiques de 12,7 mm, 48 pistes --- Format DLT 1 IEC ISO Reference number ISO/IEC 13421:1993(E) Copyright Intermational Organization for Standardization Not for Resale ISO/IEC 13421:1993 (E) Contents Page Section 1 - General 1 1 Scope 1 2 1 Conformance 2.1 Magnetic tape cartridges 1 2.2 Generating systems 1 2.3 Receiving systems 1 3 References 1 4 Definitions 1 4.1 Average Signal Amplitude 2 4.2 azimuth 2 4.3 back surface 2 4.4 Beginning-Of-Tape marker (BOT) 2 4.5 byte 2 4.6 cartridge 2 4.7 Cyclic Redundancy Check (CRC) character 2 4.8 Early Warning (EW) 2 4.9 2 Error-Detecting Code (EDC) 4.10 End-Of-Tape marker (EOT) 2 4.11 Entity 2 4.12 Error-Correcting Code (ECC) 2 4.13 flux transition position 2 4.14 flux transition spacing 2 4.15 Logical Block 4.16 logical track 2 4.17 magnetic tape 2 4.18 Master Standard Reference Tape 3 ISO/IEC1993 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 permission in writing from the publisher. ISO/IEC Copyright Office · Case postale 56 · CH-1211 Geneve 20 · Switzerland Printed in Switzerland ii r Standardizatio No reproe or networking permited without license from IHS Not for Resale ISO/IEC 13421:1993 (E) 4.19 object 3 3 4.20 physical block 4.21 physical recording density 4.22 physical track 3 4.23 Record 3 4.24 Reference Edge 3 4.25 Reference Field 3 4.26 Secondary Standard Reference Tape 3 4.27 Standard Reference Amplitude (SRA) 3 4.28 Standard Reference Current 3 3 4.29 Test Recording Current 4.30 Typical Field 3 5 3 Conventions and notations 5.1 3 Representation of numbers 5.2 Names 4 5.3 Acronyms 4 6 Environment and safety 4 6.1 Cartridge and tape testing environment 4 6.2 Cartridge operating environment 4 5 6.3 Cartridge storage environment 6.4 Safety requirements 5 6.4.1 Safeness 5 5 6.4.2 Flammability 6.5 Transportation 5 5 Section 2 - Requirements for the unrecorded tape 7 Mechanical and electrical requirements 5 7.1 5 Material 7.2 Tape length 5 7.3 Width of the tape 6 7.4 Total thickness of the tape 6 7.5 Thickness of the base material 6 7.6 Thickness of the magnetic coating 6 7.7 Thickness of the back coating 6 7.8 Tape discontinuity 6 7.9 Longitudinal curvature 6 I'6L Requirement 6 7.9.2 Procedure 6 7.10 Out-of-Plane distortions 9 7.11 Cupping 6 7.12 Roughness of the coating surfaces 7 ili NrroductornetworkingermitedwithoutlicenefromH Not fr Resale