1、 Reference numberISO/IEC 20061:2001(E)ISO/IEC 2001Information technology 12,65 mm wide magnetic tape cassette for information interchange Helical scan recording DTF-2 Technologies de linformation Cassette de bande magntique de 12,65 mm de large pour lchange dinformation Enregistrement par balayage e
2、n spirale DTF-2 National Standard of CanadaCAN/CSA-ISO/IEC 20061:04(ISO/IEC 20061:2001)International Standard ISO/IEC 20061:2001 (first edition, 2001-12-01) has been adopted without modification(IDT) as CSA Standard CAN/CSA-ISO/IEC 20061:04, which has been approved as a National Standard of Canadaby
3、 the Standards Council of Canada.ISBN 1-55397-290-2 January 2004The Canadian Standards Association (CSA), The Standards Council of Canada is theunder whose auspices this National Standard has been coordinating body of the National Standards system, produced, was chartered in 1919 and accredited by a
4、 federation of independent, autonomousthe Standards Council of Canada to the National organizations working towards the furtherStandards system in 1973. It is a not-for-profit, development and improvement of voluntarynonstatutory, voluntary membership association standardization in the national inte
5、rest.engaged in standards development and certification The principal objects of the Council are to foster activities. and promote voluntary standardization as a means CSA standards reflect a national consensus of of advancing the national economy, benefiting theproducers and users including manufac
6、turers, health, safety, and welfare of the public, assisting consumers, retailers, unions and professional and protecting the consumer, facilitating domestic organizations, and governmental agencies. The and international trade, and furthering internationalstandards are used widely by industry and c
7、ommerce cooperation in the field of standards.and often adopted by municipal, provincial, and A National Standard of Canada is a standard whichfederal governments in their regulations, particularly in has been approved by the Standards Council ofthe fields of health, safety, building and constructio
8、n, Canada and one which reflects a reasonableand the environment. agreement among the views of a number of capableIndividuals, companies, and associations across individuals whose collective interests provide to theCanada indicate their support for CSAs standards greatest practicable extent a balanc
9、e ofdevelopment by volunteering their time and skills to representation of producers, users, consumers, andCSA Committee work and supporting the Associations others with relevant interests, as may be appropriateobjectives through sustaining memberships. The more to the subject in hand. It normally i
10、s a standardthan 7000 committee volunteers and the 2000 which is capable of making a significant and timelysustaining memberships together form CSAs total contribution to the national interest.membership from which its Directors are chosen. Approval of a standard as a National Standard ofSustaining
11、memberships represent a major source of Canada indicates that a standard conforms to theincome for CSAs standards development activities. criteria and procedures established by the StandardsThe Association offers certification and testing Council of Canada. Approval does not refer to theservices in
12、support of and as an extension to its technical content of the standard; this remains thestandards development activities. To ensure the continuing responsibility of the accreditedintegrity of its certification process, the Association standards-development organization.regularly and continually aud
13、its and inspects products Those who have a need to apply standards arethat bear the CSA Mark. encouraged to use National Standards of CanadaIn addition to its head office and laboratory complex whenever practicable. These standards are subject in Toronto, CSA has regional branch offices in major to
14、periodic review; therefore, users are cautioned centres across Canada and inspection and testing to obtain the latest edition from the organizationagencies in eight countries. Since 1919, the preparing the standard.Association has developed the necessary expertise to The responsibility for approving
15、 National Standards meet its corporate mission: CSA is an independent of Canada rests with theservice organization whose mission is to provide an Standards Council of Canadaopen and effective forum for activities facilitating the 270 Albert Street, Suite 200exchange of goods and services through the
16、 use of Ottawa, Ontario, K1P 6N7standards, certification and related services to meet Canadanational and international needs.For further information on CSA services, write toCanadian Standards Association5060 Spectrum Way, Suite 100Mississauga, Ontario, L4W 5N6CanadaAlthough the intended primary app
17、lication of this Standard is stated in its Scope, it is importantto note that it remains the responsibility of the users to judge its suitability for their particular purpose.Registered trade-mark of Canadian Standards AssociationCAN/CSA-ISO/IEC 20061:04 for information interchange Helical scan reco
18、rding DTF-2Information technology 12,65 mm wide magnetic tape cassetteJanuary 2004 Canadian Standards Association CSA/1CAN/CSA-ISO/IEC 20061:04Information technology 12,65 mmwide magnetic tape cassette forinformation interchange Helicalscan recording DTF-2CSA PrefaceStandards development within the
19、Information Technology sector is harmonized with internationalstandards development. Through the CSA Technical Committee on Information Technology (TCIT),Canadians serve as the Canadian Advisory Committee (CAC) on ISO/IEC Joint Technical Committee 1 onInformation Technology (ISO/IEC JTC1) for the St
20、andards Council of Canada (SCC), the ISO memberbody for Canada and sponsor of the Canadian National Committee of the IEC. Also, as a member of theInternational Telecommunication Union (ITU), Canada participates in the International Telegraph andTelephone Consultative Committee (ITU-T).This Internati
21、onal Standard was reviewed by the CSA TCIT under the jurisdiction of the StrategicSteering Committee on Information Technology and deemed acceptable for use in Canada. (Acommittee membership list is available on request from the CSA Project Manager.) From time to time,ISO/IEC may publish addenda, co
22、rrigenda, etc. The CSA TCIT will review these documents for approvaland publication. For a listing, refer to the CSA Information Products catalogue or CSA Info Update orcontact a CSA Sales representative. This Standard has been formally approved, without modification, bythe Technical Committee and h
23、as been approved as a National Standard of Canada by the StandardsCouncil of Canada.January 2004 Canadian Standards Association 2004All rights reserved. No part of this publication may be reproduced in any form whatsoever without the prior permission ofthe publisher. ISO/IEC material is reprinted wi
24、th permission. Where the words “this International Standard” appear in thetext, they should be interpreted as “this National Standard of Canada”. Inquiries regarding this National Standard of Canada should be addressed to Canadian Standards Association 5060 Spectrum Way, Suite 100, Mississauga, Onta
25、rio, Canada L4W 5N6 1-800-463-6727 416-747-4044www.csa.caReference numberISO/IEC 20061:2001(E)ISO/IEC 2001INTERNATIONAL STANDARD ISO/IEC20061First edition2001-12-01Information technology 12,65 mm wide magnetic tape cassette for information interchange Helical scan recording DTF-2 Technologies de lin
26、formation Cassette de bande magntique de 12,65 mm de large pour lchange dinformation Enregistrement par balayage en spirale DTF-2 ISO/IEC 20061:2001(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may be printed or viewed but shal
27、l not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In downloading this file, parties accept therein the responsibility of not infringing Adobes licensing policy. The ISO Central Secretariat accepts no liability in this area.
28、Adobe is a trademark of Adobe Systems Incorporated. Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by I
29、SO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below. ISO/IEC 2001 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, elect
30、ronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISOs member body in the country of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.c
31、h Web www.iso.ch ii ISO/IEC 2001 All rights reservedISO/IEC 20061:2001(E) ISO/IEC 2001 All rights reserved iiiContents Page Section 1 - General 1 1 Scope 1 2 Conformance 1 2.1 Magnetic tape cassette 1 2.2 Generating system 1 2.3 Receiving system 1 3 Normative references 1 4 Terms and definitions 2 4
32、.1 Absolute block number 2 4.2 a.c. erase 2 4.3 algorithm 2 4.4 Append file 2 4.5 Append volume 2 4.6 Average Signal Amplitude (ASA) 2 4.7 azimuth 2 4.8 back surface 2 4.9 bit cell 2 4.10 block 2 4.11 Block Management Table (BMT) 2 4.12 byte 2 4.13 cassette 2 4.14 compressed data 2 4.15 Control Trac
33、k 2 4.16 flux transition position 2 4.17 flux transition spacing 2 4.18 Logical track set ID 2 4.19 Logical volume 2 4.20 magnetic tape 2 4.21 Master Standard Reference Tape (MSRT) 2 4.22 physical recording density 2 4.23 Reference Field (RF) 2 4.24 Secondary Standard Reference Tape (SSRT)4.25 Stand
34、ard Reference Amplitude (SRA) 3 4.26 Standard Reference Current (Ir) 3 4.27 Tape Reference Edge 3 4.28 Test Recording Current (TRC) 3 4.29 track 3 4.30 track angle 3 4.31 Track Set 3 4.32 Typical Field (TF) 3 4.33 word 3 5 Conventions and notations 3 5.1 Representation of numbers 3 5.2 Names 3 6 Acr
35、onyms 4 7 Environment and safety 4 ISO/IEC 20061:2001(E) iv ISO/IEC 2001 All rights reserved7.1 Testing environment 4 7.2 Operating environment 4 7.3 Storage environment 5 7.4 Transportation 5 7.5 Safety 5 7.6 Flammability 5 Section 2 - Requirements for the case 5 8 Dimensional and mechanical charac
36、teristics of the case 5 8.1 General 5 8.2 Type S cassette 5 8.2.1 Overall dimensions (Figure 3) 6 8.2.2 Holding areas (Figure 4) 6 8.2.3 Window 6 8.2.4 Label areas (Figure 4) 7 8.2.5 Datum areas and datum holes (Figures 5 and 6) 7 8.2.6 Support areas (Figure 5) 7 8.2.7 Guiding grooves (Figures 3 and
37、 6) 8 8.2.8 Recognition holes (Figures 6 and 7) 9 8.2.9 Write-inhibit plug (Figure 8) 10 8.2.10 Pre-positioning surface (Figures 3 and 5) 11 8.2.11 Cassette lid (Figures 9, 10, 11, 12 and 13)8.2.12 Cassette reel lock (Figure 13) 12 8.2.13 Reel access holes (Figure 6) 13 8.2.14 Reels (Figure 14) 13 8
38、.2.15 Position of the tape in the case (Figure 16) 14 8.2.16 Tape path zone (Figures 16 to 18) 14 8.2.17 Tape access cavity (Figure 19) 15 8.3 Type L cassette 30 8.3.1 Overall dimensions (Figure 22) 30 8.3.2 Holding areas (Figure 23) 30 8.3.3 Window 31 8.3.4 Label areas (Figure 23) 31 8.3.5 Datum ar
39、eas and datum holes (Figures 24 and 25) 31 8.3.6 Support areas (Figure 24) 32 8.3.7 Guiding grooves (Figure 25) 32 8.3.8 Recognition holes (Figure 26) 33 8.3.9 Write-inhibit plug (Figure 27) 34 8.3.10 Pre-positioning surface (Figures 24 and 25) 35 8.3.11 Cassette lid (Figures 28, 29, 30, 31 and 32)8
40、.3.12 Cassette reel lock (Figure 32) 36 8.3.13 Reel access holes (Figure 25) 36 8.3.14 Reels (Figure 33) 37 8.3.15 Position of the tape in the case (Figure 35) 38 8.3.16 Tape path zone (Figures 35 to 37) 38 8.3.17 Tape access cavity (Figure 38) 39 8.3.18 Cavity for compatibility with Type S cassette
41、 (Figure 39) 40 Section 3 - Requirements for the unrecorded tape 55 9 Mechanical, physical and dimensional characteristics of the tape 55 9.1 Materials 55 9.2 Tape length 55 9.3 Tape width 55 9.4 Width and position of splicing tape 55 9.5 Discontinuity 55 9.6 Tape thickness 55 9.7 Longitudinal curva
42、ture 55 9.8 Out-of-plane distortions 56 ISO/IEC 20061:2001(E) ISO/IEC 2001 All rights reserved v9.9 Coating adhesion 56 9.10 Layer-to-layer adhesion 57 9.11 Tensile strength 57 9.11.1 Breaking strength 57 9.11.2 Yield strength 57 9.11.3 Strength of splice 57 9.12 Residual elongation 57 9.13 Electric
43、al resistance of the coated surfaces 57 9.14 Tape wind 58 10 Magnetic recording characteristics 58 10.1 Typical Field (TF1) 58 10.2 Average Signal Amplitude(ASA) 59 10.3 Resolution 59 10.4 Signal-to-noise ratio (S/N) 59 10.5 Ease of erasure 59 10.6 Tape quality 59 10.6.1 Missing pulses 59 10.6.2 Mis
44、sing pulse zone 59 10.7 Inhibitor tape 59 11 Format for helical tracks 60 11.1 General description of the write data path (see Figure 42) 60 11.2 Formation of a Logical Track Set 60 11.2.1 Types of information track sets 60 11.2.2 Generation of a Logical Track Set 62 11.2.3 Subcode data field 62 11.
45、2.4 Block Management Table (BMT) 66 11.2.5 Data and information field definitions 66 11.3 Track Set information 70 11.3.1 Loading the Product Code Arrays 70 11.4 Product code array processing 72 11.4.1 Error correction method 72 11.4.2 Error correction coding for C1 Parity 72 11.5 Track assignments
46、73 11.5.1 Segments/Sectors (Figure 46) 73 11.5.2 Sync Blocks (Figure 47) 74 11.5.3 Track interleave (Figure 48) 74 11.5.4 Byte interleave across Sync Blocks (Figure 49) 77 11.5.5 Randomization 77 11.6 Formation of the contents of a helical track (Figure 50) 78 11.6.1 Segment/Sector details (Figure 4
47、7) 78 11.6.2 Channel bit coding 79 11.6.3 Interleaved-NRZ1 (Figure 51) 79 11.6.4 Tracking Pilot Signals (TPS) 79 12 Track geometry 79 12.1 General 79 12.2 Helically recorded tracks 80 12.2.1 Location of the tracks 80 12.2.2 Track width 81 12.2.3 Track angle 81 12.2.4 Track pitch 81 12.2.5 Location o
48、f elements in the helical track 82 ISO/IEC 20061:2001(E) vi ISO/IEC 2001 All rights reserved12.2.6 Location of the Data Area Reference Point 82 12.2.7 Straightness of tracks 82 12.2.8 Azimuth angles 82 12.2.9 Tracking Pilot Signals (TPS) 82 12.2.10 Amplitude of servo signals 82 12.3 Longitudinal tra
49、cks geometry 82 12.3.1 Control Track 82 12.3.2 Time Code Track signals recording position 83 13 Method of recording helical tracks13.1 Physical recording density 83 13.2 Record current optimization 83 13.3 Efficiency of erasure 83 14 Method of recording longitudinal tracks 83 14.1 Overview 83 14.2 Control Track 83 14.2.1 Signal 83 14.2.2 Polarity of magnetisation (Figure 54) 83 14.2.3 Alignment 83 14.2.4 Read signal amplitude 84 14.2.5 Quality of the Control Track 84 14.3 Time Code Track 84 14.3.1 Met
