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1、ANSI INCITS 264-1996 (R2001) (formerly ANSI X3.264-1996 (R2001) for Information Technology Unrecorded Helical-Scan Digital Computer Tape Cassette for Information Interchange 19 mm (0.748 in) Type D-1 Copyright American National Standards Institute Provided by IHS under license with ANSI Licensee=USN
2、 Ship Repair Facility Yokosuka/9961031100 Not for Resale, 05/08/2007 20:12:18 MDTNo reproduction or networking permitted without license from IHS -,-,- Copyright American National Standards Institute Provided by IHS under license with ANSI Licensee=USN Ship Repair Facility Yokosuka/9961031100 Not fo
3、r Resale, 05/08/2007 20:12:18 MDTNo reproduction or networking permitted without license from IHS -,-,- ANSI X3.264-1996 Revision and redesignation of ANSI X3.264-1996 American National Standard for Information Technology Unrecorded Helical-Scan Digital Computer Tape Cassette for Information Interch
4、ange 19 mm (0.748 in) Type D-1 Secretariat Information Technology Industry Council Approved February 5, 1996 American National Standards Institute, Inc. Copyright American National Standards Institute Provided by IHS under license with ANSI Licensee=USN Ship Repair Facility Yokosuka/9961031100 Not f
5、or Resale, 05/08/2007 20:12:18 MDTNo reproduction or networking permitted without license from IHS -,-,- American National Standard Approval of an American National Standard requires review by ANSI that the requirements for due process, consensus, and other criteria for approval have been met by the
6、 standards developer. Consensus is established when, in the judgment of the ANSI Board of Standards Review, substantial agreement has been reached by directly and materially affected interests. Substantial agreement means much more than a simple majority, but not necessarily unanimity. Consensus req
7、uires that all views and objections be considered, and that a concerted effort be made toward their resolution. The use of American National Standards is completely voluntary; their existence does not in any respect preclude anyone, whether he has approved the standards or not, from manufacturing, m
8、arketing, purchasing, or using products, processes, or procedures not conforming to the standards. The American National Standards Institute does not develop standards and will in no circumstances give an interpretation of any American National Standard. Moreover, no person shall have the right or a
9、uthority to issue an interpretation of an American National Standard in the name of the American National Standards Institute. Requests for interpretations should be addressed to the secretariat or sponsor whose name appears on the title page of this standard. CAUTION NOTICE: This American National
10、Standard may be revised or withdrawn at any time. The procedures of the American National Standards Institute require that action be taken periodically to reaffirm, revise, or withdraw this standard. Purchasers of American National Standards may receive current information on all standards by callin
11、g or writing the American National Standards Institute. Published by American National Standards Institute 11 West 42nd Street, New York, New York 10036 Copyright 1996 by Information Technology Industry Council (ITI) All rights reserved. No part of this publication may be reproduced in any form, in
12、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 America Copyright American National Standards Institute Provided by IHS under license with ANSI Licensee=USN Ship Repair Facility Yokosuka/9
13、961031100 Not for Resale, 05/08/2007 20:12:18 MDTNo reproduction or networking permitted without license from IHS -,-,- i Foreword .iii 1Scope and introduction.1 2Normative references.2 3Definitions .3 4Environmental and safety.4 5Tape mechanical and electrical properties 5 6Magnetic properties .11
14、7Cassette12 Figures 1Small cassette coding holes and user holes 16 2Medium cassette coding holes and user holes.17 3Large cassette coding holes and user holes 18 4Internal structure and tape path of small cassette (top view) 19 5Internal structure and tape path of medium cassette (top view) 20 6Inte
15、rnal structure and tape path of large cassette (top view).21 7Leader, trailer, and magnetic tape attachment.22 8Fixture for measuring electrical resistance of tape .23 9Datum area, support area, and holding area of small cassette24 10Bottom view of small cassette.25 11Top and side view of small cass
16、ette 26 12Cassette reel .27 13Relationship between reel and reel table.28 14Small cassette reel lock and release .29 15Lid lock and release .30 16Datum area, support area, and holding area of medium cassette31 17Bottom view of medium cassette.32 18Top and side view of medium cassette 33 19Datum area
17、, support area, and holding area of large cassette 34 20Bottom view of large cassette .35 21Top and side view of large cassette.36 22Large cassette reel lock and release.37 23Lid structure.38 24Medium cassette reel lock release 39 25Minimum space for loading mechanism.40 Contents Page Copyright Amer
18、ican National Standards Institute Provided by IHS under license with ANSI Licensee=USN Ship Repair Facility Yokosuka/9961031100 Not for Resale, 05/08/2007 20:12:18 MDTNo reproduction or networking permitted without license from IHS -,-,- ii Annexes ARecommendations for transportation 41 BSecondary r
19、eference tape user procedure.43 CBibliography 45 Page Copyright American National Standards Institute Provided by IHS under license with ANSI Licensee=USN Ship Repair Facility Yokosuka/9961031100 Not for Resale, 05/08/2007 20:12:18 MDTNo reproduction or networking permitted without license from IHS
20、-,-,- iii This standard presents the minimum requirements for 19 mm (0.748 in) wide magnetic tape cassette type D-1 to allow parties that comply with these requirements reliably to interchange information. This standard addresses the tape cassette dimensions and tolerances and the properties of the
21、magnetic media. This standard was developed by Sub-Committee X3B5 for digital magnetic tape. This group consists of experienced and qualified specialists on the recording of digital information on magnetic tape. In the development of this standard, careful consideration was given to current practice
22、s, existing equipment and supplies, achieving the broadest possible acceptance, and providing a basis for future improvement in the use of the medium. This standard has three annexes. This standard is intended to be used with American National Standard for Information Systems 19 mm type ID-1 recorde
23、d instrumentation Digital cassette tape format, ANSI X3.175-1990, developed by ASC X3B6, and was developed in conjunction with a combined unrecorded/recorded stan- dard Helical-scan computer tape cassette for information interchange 19 mm (0.748 in) type DD-1 by ASC X3B5 Requests for interpretation,
24、 suggestions for improvement or addenda, or defect reports are welcome. They should be sent to 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 the Accredited Standards Commit
25、tee on Information Technology, X3. Committee approval of this standard does not necessarily imply that all committee members voted for its approval. At the time it approved this standard, the X3 Committee had the following members: James D. Converse, Chair Donald C. Loughry, Vice-Chair Joanne Flanag
26、an, Secretary Organization RepresentedName of Representative American Nuclear SocietyGeraldine C. Main Sally Hartzell (Alt.) AMP, Inc. Edward Kelly Charles Brill (Alt.) Apple Computer, IncDavid K. Michael AT and a magnetic tape of 19 mm (0.748 in) nominal width held inside the case on twin hubs. The
27、 tape shall be transported between the hubs for digital recording at a physical density of 2 252 ftpmm (57 200 ftpi). Information interchange between information processing systems requires the use of this standard in conjunction with a recorded standard. Additionally, information interchange requir
28、es (at a minimum) the utilization of a labeling and file structure and an interchange code as agreed upon by the interchange parties. It is not within the scope of this standard to describe a recorded format, nor to address standards for labeling and file structure. 1.2 Purpose The purpose of this s
29、tandard is to define the requirements and supporting test methods necessary to ensure information interchange at acceptable performance levels. It is distinct from a specification in that it delineates a minimum number of restrictions consistent with compatibility in interchange transactions. The pe
30、rformance levels contained in this standard represent the minimum acceptable levels of performance for interchange purposes. They, therefore, represent the performance levels that the interchange items should meet or surpass during their useful life and thus define end-of-life criteria for interchan
31、ge purposes. The performance levels in this standard are not intended to be employed as substitutes for purchase specifications. Wherever feasible, quantitative performance levels that shall be met or exceeded to comply with this standard are given. In all cases, including those in which quantitativ
32、e limits for requirements falling within the scope of this standard are not stated but left to agreement between interchange parties, standard test methods and measurement procedures shall be used to determine such limits. The interchange parties complying with the applicable standards should be abl
33、e to achieve compatibility without the need for additional exchange of technical information. Copyright American National Standards Institute Provided by IHS under license with ANSI Licensee=USN Ship Repair Facility Yokosuka/9961031100 Not for Resale, 05/08/2007 20:12:18 MDTNo reproduction or networ
34、king permitted without license from IHS -,-,- ANSI X3.264-1996 2 1.3 Conformance A magnetic tape cassette conforms to this standard if it satisfies all mandatory requirements. The tape requirements shall be satisfied throughout the extent of the tape. 1.4 Dimensions The original dimensions and quant
35、ities for all numeric values in this standard are in the International System of Units (SI). Conversions of these units to U.S. Customary engineering units (similar to British Imperial units) and centimeter-gram-second electromagnetic units (cgs emu) have been incorporated in accordance with the pro
36、cedures described in ANSI/IEEE 268. Units of either of the two measurement systems may be referred to but the two systems should not be intermixed or reconverted. Conversions of toleranced dimensions and quantities in this standard have been performed in accordance with Method A of ANSI/IEEE 268 and
37、 ISO 370, International standard toleranced dimensions Conversions from millimeters into inches and vice versa, to maintain the implied correspondence between the accuracy of the original data and the number of significant digits and rounding of the converted values. In the national standards of ISO
38、 member bodies, additional rounding may be done to produce “preferred“ values. These values should lie within or close to the original tolerances. 2 Normative references The following standards contain provisions which, through reference in the text, constitute provisions of this standard. At the ti
39、me of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards listed below. Members of IEC and ISO maintain registers of
40、 currently valid International Standards. ANSI X3.175-1990, 19 mm type ID-1 recorded instrumentation Digital cassette tape format ANSI/IEEE 268-1982, American national standard metric practice ISO 370:1975, International standard tolerance dimensions Conversions from millimeters into inches and vice
41、 versa SMPTE 224M, Television digital component recording 19 mm type D-1 format Tape record SMPTE 225M, Television digital component recording 19 mm type D-1 format Magnetic tape SMPTE 226M, Television digital component recording 19 mm type D-1 format Tape cassette SMPTE RP-103-1993, Care, handling,
42、 operation and storage of magnetic recording tape for television NOTE Subsequent references to these documents will be by document number only. Copyright American National Standards Institute Provided by IHS under license with ANSI Licensee=USN Ship Repair Facility Yokosuka/9961031100 Not for Resale
43、, 05/08/2007 20:12:18 MDTNo reproduction or networking permitted without license from IHS -,-,- ANSI X3.264-1996 3 3 Definitions 3.1average signal amplitude: The average peak-to-peak value of the signal output of the read head measured over a minimum of 280 000 flux transitions, exclusive of dropout
44、s. 3.2back surface: The surface of the tape opposite the magnetic coating used to record data. 3.3basic dimension: A fundamental dimension on which the tape record of this standard is based. 3.4beginning of tape (BOT): A point denoted by the joining of the leader to the magnetic tape by a splice, wh
45、en all of the magnetic tape is wound on the supply reel. 3.5cleaning cassette: The cleaning cassette is intended for the periodic maintenance of the tape transport mechanisms that directly contact the tape. The cleaning cassette contains a cleaning tape, attached to the reel hubs via leader and trai
46、ler tapes. 3.6dropout: A loss of read signal amplitude below a given threshold. 3.7end of tape (EOT): A point denoted by the joining of the trailer to the magnetic tape by a splice, when all of the magnetic tape is wound on the take-up reel. 3.8erase: To remove all magnetically recorded information
47、from the tape. 3.9erasing field: A magnetic field of sufficient strength to remove the recorded flux transitions from the tape. 3.10flux transition spacing: The distance along a track between successive flux transitions. The spacing is usually expressed as flux transitions per millimeter (ftpmm) or
48、flux transitions per inch (ftpi). (See physical recording density.) 3.11leader: A nonmagnetic length of transparent tape joined to each end of the magnetic tape to provide strength and convenience. At the beginning of the tape, it identifies the storage position of the tape. At the end of the tape, it indicates that the permissible recording area has been exceeded. 3.12magnetic tape: A tape that will accept and retain the magnetic signals intended for input, output, and storage purposes on computers and associated equipm