ANSI INCITS 264-1996 Information Technology - Unrecorded Helical-Scan Digital Computer Tape Cassette for Information Interchange 19 mm (0.748 in) Type D-1.pdf
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1、ANSI INCITS 264-1996 (R2001)(formerly ANSI X3.264-1996 (R2001)for Information Technology Unrecorded Helical-ScanDigital Computer Tape Cassettefor Information Interchange19 mm (0.748 in) Type D-1ANSIX3.264-1996Revision and redesignation ofANSI X3.264-1996American National Standardfor Information Tech
2、nology Unrecorded Helical-Scan Digital Computer Tape Cassette for Information Interchange 19 mm (0.748 in) Type D-1SecretariatInformation Technology Industry CouncilApproved February 5, 1996American National Standards Institute, Inc.AmericanNationalStandardApproval of an American National Standard r
3、equires review by ANSI that therequirements for due process, consensus, and other criteria for approval havebeen met by the standards developer.Consensus is established when, in the judgment of the ANSI Board of StandardsReview, substantial agreement has been reached by directly and materiallyaffect
4、ed interests. Substantial agreement means much more than a simplemajority, but not necessarily unanimity. Consensus requires that all views andobjections be considered, and that a concerted effort be made toward theirresolution.The use of American National Standards is completely voluntary; their ex
5、istencedoes not in any respect preclude anyone, whether he has approved the standardsor not, from manufacturing, marketing, purchasing, or using products, processes,or procedures not conforming to the standards.The American National Standards Institute does not develop standards and will inno circum
6、stances give an interpretation of any American National Standard.Moreover, no person shall have the right or authority to issue an interpretation ofan American National Standard in the name of the American National StandardsInstitute. Requests for interpretations should be addressed to the secretari
7、at orsponsor whose name appears on the title page of this standard.CAUTION NOTICE: This American National Standard may be revised orwithdrawn at any time. The procedures of the American National StandardsInstitute require that action be taken periodically to reaffirm, revise, or withdrawthis standar
8、d. Purchasers of American National Standards may receive currentinformation on all standards by calling or writing the American National StandardsInstitute.Published byAmerican National Standards Institute11 West 42nd Street, New York, New York 10036Copyright 1996 by Information Technology Industry
9、Council (ITI)All rights reserved.No part of this publication may be reproduced in anyform, in an electronic retrieval system or otherwise,without prior written permission of ITI, 1250 Eye Street NW,Washington, DC 20005.Printed in the United States of AmericaiForeword .iii1 Scope and introduction.12
10、Normative references.23 Definitions .34 Environmental and safety.45 Tape mechanical and electrical properties 56 Magnetic properties .117 Cassette12Figures1 Small cassette coding holes and user holes 162 Medium cassette coding holes and user holes.173 Large cassette coding holes and user holes 184 I
11、nternal structure and tape path of small cassette (top view) 195 Internal structure and tape path of medium cassette (top view) 206 Internal structure and tape path of large cassette (top view).217 Leader, trailer, and magnetic tape attachment.228 Fixture for measuring electrical resistance of tape
12、.239 Datum area, support area, and holding area of small cassette2410 Bottom view of small cassette.2511 Top and side view of small cassette 2612 Cassette reel .2713 Relationship between reel and reel table.2814 Small cassette reel lock and release .2915 Lid lock and release .3016 Datum area, suppor
13、t area, and holding area of medium cassette3117 Bottom view of medium cassette.3218 Top and side view of medium cassette 3319 Datum area, support area, and holding area of large cassette 3420 Bottom view of large cassette .3521 Top and side view of large cassette.3622 Large cassette reel lock and re
14、lease .3723 Lid structure.3824 Medium cassette reel lock release 3925 Minimum space for loading mechanism.40ContentsPageiiAnnexesA Recommendations for transportation 41B Secondary reference tape user procedure.43C Bibliography 45PageiiiThis standard presents the minimum requirements for 19 mm (0.748
15、 in)wide magnetic tape cassette type D-1 to allow parties that comply withthese requirements reliably to interchange information. This standardaddresses the tape cassette dimensions and tolerances and the propertiesof the magnetic media.This standard was developed by Sub-Committee X3B5 for digital m
16、agnetictape. This group consists of experienced and qualified specialists on therecording of digital information on magnetic tape. In the development ofthis standard, careful consideration was given to current practices, existingequipment and supplies, achieving the broadest possible acceptance, and
17、providing a basis for future improvement in the use of the medium. Thisstandard has three annexes.This standard is intended to be used with American National Standard forInformation Systems 19 mm type ID-1 recorded instrumentation Digitalcassette tape format, ANSI X3.175-1990, developed by ASC X3B6,
18、 andwas developed in conjunction with a combined unrecorded/recorded stan-dard Helical-scan computer tape cassette for information interchange 19mm (0.748 in) type DD-1 by ASC X3B5Requests for interpretation, suggestions for improvement or addenda, ordefect reports are welcome. They should be sent t
19、o the X3 Secretariat,Information Technology Industry Council, 1250 Eye Street, NW,Washington DC 20005-3922.This standard was processed and approved for submittal to ANSI by theAccredited Standards Committee on Information Technology, X3.Committee approval of this standard does not necessarily imply
20、that allcommittee members voted for its approval. At the time it approved thisstandard, the X3 Committee had the following members:James D. Converse, ChairDonald C. Loughry, Vice-ChairJoanne Flanagan, SecretaryOrganization Represented Name of RepresentativeAmerican Nuclear SocietyGeraldine C. MainSa
21、lly Hartzell (Alt.)AMP, Inc. Edward KellyCharles Brill (Alt.)Apple Computer, IncDavid K. MichaelAT and a magnetic tape of 19 mm (0.748 in) nominal width held inside the case on twinhubs. The tape shall be transported between the hubs for digital recording at a physicaldensity of 2 252 ftpmm (57 200
22、ftpi).Information interchange between information processing systems requires the use of thisstandard in conjunction with a recorded standard.Additionally, information interchange requires (at a minimum) the utilization of a labeling andfile structure and an interchange code as agreed upon by the in
23、terchange parties.It is not within the scope of this standard to describe a recorded format, nor to addressstandards for labeling and file structure.1.2 PurposeThe purpose of this standard is to define the requirements and supporting test methodsnecessary to ensure information interchange at accepta
24、ble performance levels. It is distinctfrom a specification in that it delineates a minimum number of restrictions consistent withcompatibility in interchange transactions.The performance levels contained in this standard represent the minimum acceptable levelsof performance for interchange purposes.
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