CAN CSA-ISO IEC 20062-2004 Information technology - 8 mm wide magnetic tape cartridge for information interchange - Helical scan recording - VXA-1 format.pdf

1、 Reference numberISO/IEC 20062:2001(E)ISO/IEC 2001Information technology 8 mm wide magnetic tape cartridge for information interchange Helical scan recording VXA-1 format Technologies de linformation Cartouche de bande magntique de 8 mm de large pour change dinformations Enregistrement par balayage

2、en spirale Format VXA-1 National Standard of CanadaCAN/CSA-ISO/IEC 20062:04(ISO/IEC 20062:2001)International Standard ISO/IEC 20062:2001 (first edition, 2001-12-15) has been adopted without modification(IDT) as CSA Standard CAN/CSA-ISO/IEC 20062:04, which has been approved as a National Standard of

3、Canadaby the Standards Council of Canada.ISBN 1-55397-289-9 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 accredi

4、ted by a 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 natio

5、nal interest.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

6、 manufacturers, 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 indust

7、ry and commerce 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 con

8、struction, 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

9、a balance 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 no

10、rmally is 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 ofSus

11、taining 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 theserv

12、ices in 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 continu

13、ally audits 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 m

14、ajor to 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 a

15、pproving 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 thr

16、ough the 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 pri

17、mary application 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 20062:04 information interchange Helical scan

18、recording VXA-1 formatInformation technology 8 mm wide magnetic tape cartridge forJanuary 2004 Canadian Standards Association CSA/1CAN/CSA-ISO/IEC 20062:04Information technology 8 mm wide magnetic tape cartridgefor information interchange Helical scan recording VXA-1 formatCSA PrefaceStandards devel

19、opment within the 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/IE

20、C JTC1) for the Standards 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

21、-T).This International 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 p

22、ublish addenda, corrigenda, 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 Technic

23、al Committee and has 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 materi

24、al is reprinted with 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,

25、 Mississauga, Ontario, Canada L4W 5N6 1-800-463-6727 416-747-4044www.csa.caReference numberISO/IEC 20062:2001(E)ISO/IEC 2001INTERNATIONAL STANDARD ISO/IEC20062First edition2001-12-15Information technology 8 mm wide magnetic tape cartridge for information interchange Helical scan recording VXA-1 form

26、at Technologies de linformation Cartouche de bande magntique de 8 mm de large pour change dinformations Enregistrement par balayage en spirale Format VXA-1 ISO/IEC 20062:2001(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may be

27、printed or viewed but shall 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 n

28、o liability in this area. 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 fil

29、e is suitable for use by ISO 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 f

30、orm or by any means, electronic 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 0

31、9 47 E-mail copyrightiso.ch Web www.iso.ch ii ISO/IEC 2001 All rights reservedISO/IEC 20062:2001(E) ISO/IEC 2001 All rights reserved iiiContents Section 1 - General 1 1 Scope 1 2 Conformance 1 2.1 Magnetic tape cartridges 1 2.2 Generating drive 1 2.3 Receiving drive 1 3 Normative references 1 4 Term

32、s and definitions 2 4.1 ac erase 2 4.2 algorithm 2 4.3 Average Signal Amplitude 2 4.4 azimuth 2 4.5 back surface 2 4.6 Beginning of Data (BOD) 2 4.7 Beginning of Tape (BOT) 2 4.8 bit cell 2 4.9 byte 2 4.10 cartridge 2 4.11 Channel bit 2 4.12 Cyclic Redundancy Check (CRC) character 2 4.13 End of Data

33、 (EOD) 2 4.14 End of Partition (EOP) 2 4.15 End of Tape (EOT) 2 4.16 Error Correcting Code (ECC) 2 4.17 File Mark 2 4.18 Logical Block 2 4.19 magnetic tape 2 4.20 Master Standard Reference Tape 2 4.21 Partition 2 4.22 physical recording density 2 4.23 Reference Field 2 4.24 Secondary Standard Refere

34、nce Tape (SSRT) 2 4.25 Set Mark 2 4.26 Standard Reference Amplitude (SRA) 3 4.27 Standard Reference Current (Ir) 3 4.28 Tape Reference Edge 3 4.29 Test Recording Current (TRC) 3 4.30 Track 3 4.31 Typical Field 3 5 Conventions and Notations 3 5.1 Representation of numbers 3 5.2 Names 3 6 Acronyms 3 I

35、SO/IEC 20062:2001(E) iv ISO/IEC 2001 All rights reserved7 Environment and Safety 4 7.1 Testing environment 4 7.2 Operating environment 4 7.3 Storage environment 4 7.4 Transportation 4 7.5 Safety 4 7.6 Flammability 4 Section 2 - Requirements for the case 4 8 Dimensional and mechanical characteristics

36、 of the case 4 8.1 General 4 8.2 Overall dimension 5 8.3 Holding areas 5 8.4 Cartridge insertion 6 8.5 Window 7 8.6 Loading grips 7 8.7 Label areas 7 8.8 Datum areas and datum holes 7 8.9 Support areas 8 8.10 Recognition holes 9 8.11 Write-inhibit hole 10 8.12 Pre-positioning surfaces 10 8.13 Lid 10

37、 8.14 Cartridge reel lock 11 8.15 Reel access holes 12 8.16 Interface between the reels and the drive spindles 12 8.17 Light path 13 8.18 Position of the tape in the case 14 8.19 Tape path zone 14 8.20 Tape access cavity 15 8.21 Tape access cavity clearance requirements 15 Section 3 - Requirements f

38、or the Unrecorded Tape 32 9 Mechanical, physical and dimensional characteristics of the tape 32 9.1 Materials 32 9.2 Length 32 9.2.1 Length of the magnetic tape 32 9.2.2 Length of leader and trailer tapes 32 9.2.3 Length of the splicing tape 32 9.3 Width 32 9.3.1 Width of magnetic, leader and traile

39、r tape 32 9.3.2 Width and position of the splicing tape 33 9.3.3 Edge weave 33 9.4 Discontinuities 34 9.5 Thickness 34 9.5.1 Thickness of the magnetic tape 34 9.5.2 Thickness of leader and trailer tape 34 9.5.3 Thickness of the splice tape 34 9.6 Longitudinal curvature 34 9.7 Cupping 34 9.8 Coating

40、adhesion 34 9.9 Layer-to-layer adhesion 35 9.10 Tensile strength 35 9.10.1 Breaking strength 35 9.10.2 Yield strength 35 9.11 Residual elongation 36 9.12 Electrical resistance of the recording surface 36 ISO/IEC 20062:2001(E) ISO/IEC 2001 All rights reserved v9.13 Tape winding 36 9.14 Light transmit

41、tance of tape 36 10 Magnetic recording characteristics 36 10.1 Test conditions 37 10.2 Typical Recording Current 37 10.3 Signal Amplitude 37 10.4 Resolution 37 10.5 Signal-to-Noise Ratio 37 10.6 Ease of erasure 38 10.7 Tape quality 38 10.7.1 Missing pulses 38 10.7.2 Missing pulse zone 38 10.7.3 Over

42、write 38 Section 4 - Requirements for an Interchanged Tape 38 11 Track Format 38 11.1 General 38 11.2 Physical Logical Block Format 39 11.2.1 Logical Block Set (LBS) 39 11.2.2 Logical Blocks 40 11.2.3 Segment Packets 40 11.2.4 Segment Overhead Packets 40 11.2.5 Skipped Segment Packets 44 11.2.6 Segm

43、ent ECC packets 44 11.2.7 Segment flush 45 11.3 Track Packet format 45 11.3.1 Virtual Packet Address 45 11.3.2 Local Packet Address 45 11.3.3 Packet data 47 11.3.4 Packet CRC 48 11.3.5 Packet Reed-Solomon ECC 48 11.4 Control packet format 48 11.5 Packet framing sync 51 12 Tape Format 51 12.1 Track e

44、lements 52 12.2 Data track format 52 12.2.1 Order of packets in a data track 52 12.2.2 Rewrite 52 12.3 Gap tracks 53 13 Method of recording 54 13.1 Physical recording density 54 13.1.1 Long-term average bit cell length 54 13.1.2 Short-term average bit cell length 54 13.1.3 Rate of change 54 13.2 Bit

45、 shift 54 13.3 Amplitude of Data Signals 54 14 Track geometry 54 14.1 General 54 14.2 Track pitch 55 14.3 Average track pitch 55 14.4 Track width 55 14.5 Track angle 55 14.6 Track length 55 14.7 Guard band 55 ISO/IEC 20062:2001(E) vi ISO/IEC 2001 All rights reserved14.8 Azimuth angles 56 14.9 Track

46、linearity 56 15 Layout of a tape 56 15.1 General 56 15.2 Beginning of Partition 56 15.3 Tape Header Record (THR) 56 15.4 Data area 57 15.5 Tape Directory Record 57 15.6 End of Data 58 15.7 End of Partition (EOP) 58 Annexes A - Measurement of Light Transmittance of Tape and Leaders 59 B - The Packet

47、ECC 62 C - The Segment ECC 63 D - Generation of the Segment Overhead CRCs 64 E - Generation of the Segment Data CRC 65 F - Generation of the Packet CRC 66 G - Representation of 8-bit bytes by 14-bit patterns 67 H - Measurement of bit shift 75 J - Tape Count 77 K - Recommendations for transportation

48、78 ISO/IEC 20062:2001(E) ISO/IEC 2001 All rights reserved viiForeword ISO (the International Organization for Standardization) and IEC (the International Electrotechnical Commission) form the specialized system for worldwide standardization. National bodies that are members of ISO or IEC participate

49、 in the development of International Standards through technical committees established by the respective organization to deal with particular fields of technical activity. ISO and IEC technical committees collaborate in fields of mutual interest. Other international organizations, governmental and non-governmental, in liaison with ISO and IEC, also take part in the work. In the field of information technology, ISO and IEC have established a joint technical committee, ISO/IEC JTC 1. International St