ISO/IEC INTERNATIONAL STANDARD 8441-2 First edition 1991-08-01 Information technology -- High density digital recording (HDDR) - Part 2: Guide for interchange practice Technologies de I'information -- Enregistrement numerique a haute densite (HDDR) Partie2:GuidepourI'échanged'information Referencenumber ISO/IEC 8441-2:1991(E) ISO/IEC 8441-2:1991(E) Contents Page Scope 2 Normative references 3 Definitions 4 Recording and reproducing characteristics 4.1 General 4.2 Tape speeds 4.3 Track configurations 4.4 Recorder/reproducercharacteristics 4.5 Othercharacteristics 6 Methods for high density digital recording 5 15 Introduction 15 5.2 Recordtransferfunction 15 5.3 Fluxtransitiondensities and rates forhighdensityrecording 15 5.4 Data input/output 16 5.5 Data sense 16 5.6 Reproduce equalization 16 5.7 Othersystemparameter 17 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 microfilm, without permission in writing from the publisher. ISO/IEC Copyright Office·Case Postale 56·CH-1211Geneve20·Switzerland Printed in Switzerland ii ISO/IEC 8441-2:1991(E) 5.8 Auxiliarydata recording 17 Annexes Operating modes,performance categories,and cross-play criteria A forhigh density PCM recording systems A.1 Performancecategories 18 A.1.1 General 18 A.1.2 Record head gap length for category A and category B performance 18 A.1.3 Recordhead gaplengthforcategory Cperformance A.1.4 Operatingmodes 19 A.2Single track serial high density recording 19 A.2.1 Serial high density recording with wideband analogue recorder/reproducer (category A) 19 A.2.2 Parallel high density digital recording 21 B Recording techniques 22 B.1 Recording code names and their abbreviations 22 B.2 Enhanced NRZformatforparallelHDDR 22 ENRZ coding B.2.1 22 B.2.2 ENRZ-parallelHDDRformat 22 B.2.3 Summary of enhanced NRZ format 22 B.3 Millersquaredformat (M2)forparallel HDDR 23 B.3.1 Miller squared coding 23 B.3.2 M2 formatforparallelHDDR 23 B.3.3 Summary of M2 format 24 B.3.4 M2format bandwidth utilization/packing density 24 B.4 Randomized NRZ-Lformat parallel HDDR 24 B.4.1 RNRZ-L coding 24 B.4.2 RNRZ-LparallelHDDRformat 24 B.4.3 Summary of randomized NRZ-Lformat 25 B.4.4 Randomized NRZ-Lformat bandwidth utilization/packing density 25 PROP formatfor parallel HDDR (Pseudo random odd parity) B.5 26 B.5.1 General 26 ili