ISO/IEC INTERNATIONAL STANDARD 8441-1 First edition 1991-05-15 Information technology --- High density digital recording (HDDR) Part 1: Unrecorded magnetic tape for (HDDR) applications Technologies de I'information -Enregistrement numeriquea haute densité(HDDR) Partie1:Bandemagnetiqueviergepour les applicationsHDDR Reference number ISO/IEC 8441-1:1991(E) ISO/IEC8441-1:1991(E) Contents Page Scope Normative references 2 3 Definitions 4 General 3 4.1 Materials 3 4.2 Tape reels 3 4.3 Tape wind 3 4.4 Packaging 3 5 Test conditions 3 5.1 General 3 5.2 Conditioning 3 5.3 Test environment 3 6 Dimensions 3 6.1 Tape width 3 6.2 Tape length 6.3 Tape thickness 4 7 Physical properties 4 7.1 Yield strength 4 7.2 Elongationunderstress 4 8 Performance 5 8.1 Referencetestsystem 5 8.2 Sensitivity 5 8.3 Wavelength response 5 8.4 Outputlevel uniformity (longterm) 6 8.5 Instantaneousnonuniformity(dropouts) 6 ISO/IEC1991 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 microfitm, without permission in writing from the pubisher. ISO/IECCopyright Office·CasePostale56·CH-1211Geneve20·Switzerland Printed in Switzerland ii ISO/IEC8441-1:1991(E) 8.6 Signal-to-noise ratio 6 8.7 Ease of erasure 8.8 Electrical surface resistance 8.9 Environmentalperformance 8.10 Durability 8.11 Abrasivity Annexes A Glass- and metal-flanged tape reels 10 B Wear of recording heads 11 C Environmental conditions 12 C.1 General 12 C.2 Normal operating conditions 12 C.3 Extendedoperating conditions 12 C.4 Severe operating conditions3) 12 C.5 Shipping and short-term storage 12 C.6 Extended shipping and short-term storage 12 C.7 Recommended long-term storage 12 C.8 Deterioration of tape arising from exposure to adverse environmental conditions 12 D Severe operating conditions 14 D.1 Application 14 D.2 Conditions 14 D.3 Environmentai performance tests for limited duration recording under severe conditions 14 D.3.1 Definition of severe conditions 14 D.3.2 Requirement 14 D.3.3 Test procedure 14 E Surface electrical resistance testing 16 E.1 Scope 16 E.2 Test specimens 16 E.3 Apparatus 16 E.3.1 Electrodesfortestinginsulationresistance 16 ii