ANSI INCITS 180-1990 Information Systems - Magnetic Tape and Cartridge for Information Interchange - 18-Track Parallel 1 2 inch (12.65 mm) 37 871 cpi (1491 cpmm) Group-Coded - Requ.pdf
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1、ANSI INCITS 180-1990 (R2001) (formerly ANSI X3.180-1990 (R2001)for Information Systems Magnetic Tape and Cartridge forInformation Interchange 18-Track, Parallel,1/2 inch (12.65 mm), 37 871 cpi(1491 cpmm), Group-Coded Requirements for RecordingAmericanNationalStandardApproval of an American National
2、Standard requires 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 materi
3、allyaffected 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
4、; their existencedoes 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 i
5、nno circumstances 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
6、 secretariat 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 withdrawth
7、is standard. 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 1990 by Information Technology
8、 Industry 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 AmericaANSI X3.1 80-l 990 American Nati
9、onal Standard for Information Systems - Magnetic Tape and Cartridge for Information Interchange - 18-Track, Parallel, l/2 inch (12.65 mm), 37 871 cpi (1491 cpmm), Group-Coded - Requirements for Recording Secretariat Computer and Business Equipment Manufacturers Association Approved January 22,199O A
10、merican National Standards Institute, Inc XON PAGE Contents SE( 3. 4. 5. 6. Scope, Purpose, and Conformance 8 1.1 Scope . .8 1.2 Purpose . 8 1.3 Conformance 9 Referenced and Related Standards and Publications .9 2.1 Referenced American National Standards .9 2.2 Other Referenced Standards 9 2.3 Refer
11、enced Publication 9 2.4 Related Standards . 9 Definitions . :. . ! . . .9 Environment and Safety . 12 4.1 Testing Environment of Tape and Cartridge .12 4.2 Operating Environment of Cartridge .12 4.3 Storage Environment of Cartridge . 12 4.4 Transportation 12 4.5 Safety . 12 Mechanical and Electrical
12、 Requirements of Tape .12 5.1 Material 12 5.2 Length of Tape . 12 5.3 Width 13 5.4 Total Thickness 13 5.5 Base-Material Thickness . .13 5.6 Discontinuity 13 5.7 Longitudinal Curvature 13 5.8 Out-of-Plane Distortions 13 5.9 Cupping 13 5.10 Dynamic Frictional Characteristics 13 5.11 Coating Adhesion .
13、 14 5.12 FIexuraI Rigidity .14 5.13 Electrical Resistance of the Coated Surface 14 5.14 Pre-Record Condition 15 5.15 Inhibitor Tape . 15 5.16 Abrasivity . 15 Magnetic-Recording Performance of Tape . 15 6.1 Typical Field 16 6.2 Signal Amplitude . 16 6.3 Resolution 16 6.4 Overwrite . 16 6.5 Narrow-Ban
14、d Signal-to-Noise Ratio (NB-SNR) .16 Quality of Tape 16 7.1 Dropout 17 7.2 Coincident Dropout 17 7.3 Durability of Tape 17 Mechanical Specifications of the Tape Cartridge . .17 8.1 Label Areas of Cartridge Case . 17 8.2 Locating Areas of Cartridge Case 17 8.3 Flexibility of Cartridge Case 18 8.4 Fil
15、e-Protect Mechanism . I8 8.5 Tape-Reel Hub . I8 8.6 Metallic Insert 18 SECTION PAGE 8.7 Brake Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 8.8 Winding o
16、f Tape . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . :i 8.9 Winding Tension . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
17、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.10 Circumference of Tape Reel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 8.11 MomentofInerti
18、aofTapeReel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 8.12 Leader Block Tape Attachment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
19、19 8.13 Leader Block Pickup Position . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 8.14 Leader Block Insertion Force . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
20、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 8.15 Leader Block Pull-Out Force and Work . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 9. Recording . . . . . . . . . . . . . . 20 . . . . . . . . . . . . . . . .
21、. 9.1 Physicai Recording Density . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 9.2 Bit-Cell Length . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
22、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 9.3 Average Bit-Cell Length . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 9.4 Long-Ter
23、m Average Bit-Cell Length . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 9.5 Short-Term Average Bit-Cell Length . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
24、. . . . 20 9.6 Rate of Change . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 9.7 Bit Shift . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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