1、ANSI INCITS 265-1995 (R2001)(formerly ANSI X3.265-1995 (R2001)for Information Technology Magnetic Tape and Cartridge forInformation Interchange Unrecorded, 36-track, Parallel,12.57 mm (0.495 in),1944 ftpmm (49 378 ftpi)Group-Coded RecordingANSI X3.265-l 995 American National Standard for Information
2、 Technology - Magnetic Tape and Cartridge for Information Interchange - Unrecorded, 36-track, Parallel, 12.57 mm (0.495 in), 1944 ftpmm (49 378 ftpi) Group-Coded Recording Secretariat Information Technology Industry Council Approved June 6, 1995 American National Standards Institute, Inc. American A
3、pproval of an American National Standard requires verification by ANSI that the National Standard requirements for due process, consensus, and other criteria for approval have been met by the standards developer. Consensus is established when, in the judgment of the ANSI Board of Standards Review, s
4、ubstantial agreement has been reached by directly and materially affected interests. Substantial agreement means much more than a simple majority, but not necessarily unanimity. Consensus requires that all views and objections be considered, and that a concerted effort be made toward their resolutio
5、n. 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, marketing, purchasing, or using products, processes, or procedures not conforming to the standards. The Ameri
6、can 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 authority to issue an interpretation of an American National Standard in the name of the American National St
7、andards 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 CAUTION NOTICE: This American National Standard may be revised or withdrawn at any time. The procedures of the American National Standards Institut
8、e 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 calling or writing the American National Standards Institute. CAUTION: The developers of this standard have reques
9、ted that holders of patents that may be required for the implementation of the standard disclose such patents to the publisher. However, neither the developers nor the publisher have undertaken a patent search in order to identify which, if any, patents may apply to this standard. As of the date of
10、publication of this standard and following calls for the identification of patents that may be required for the implementation of the standard, no such claims have been made. No further patent search IS conducted by the developer or publisher in respect to any standard it processes. No representatio
11、n IS made or implied that licenses are not required to avoid infringement in the use of this standard. Published by American National Standards Institute 11 West 42nd Street, New York, New York 10036 Copyright 01995 by American National Standards Institute All rights reserved. No part of this public
12、ation may be reproduced in any form, in an electronic retrieval system or otherwise, without prior written permission of the publisher. Printed in the United States of America APS2C995145 Contents Page Foreword . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
13、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iv 1 1.1 1.2 1.3 2 3 4 4.1 4.2 4.3 4.4 4.5 5 5.1 5.2 5.3 5.4 5.5 5.6 5.7 5.8 5.9 Scope, purpose, and application .l Scope . 1 Purpose . 1 Application . 1 Normative references. . .2 Definitions 2
14、Environment and safety 4 Testing environment of tape and cartridge . .4 Operating environment of cartridge .4 Storage environment of cartridge . .4 Transportation 4 Safety . .4 Mechanical and electrical requirements of tape .5 Material . .5 Length of tape . .5 Width .5 Total thickness .5 Base-materi
15、al thickness . .5 Discontinuity .5 Longitudinal curvature 5 Out-of-plane distortions . .5 Cupping .5 5.10 Dynamic frictional characteristics . .6 5.1 1 Coating adhesion .7 5.12 Flexural rigidity .7 5.13 Electrical resistance of the coated surface . .8 5.14 Pre-record condition .8 5.15 Inhibitor tape
16、 . .8 5.16 Abrasivity .8 6 6.1 6.2 6.3 6.4 6.5 6.6 7 7.1 7.2 7.3 8 8.1 8.2 Magnetic recording performance of tape .12 Typical field . .12 Signal amplitude .12 Resolution . .12 Overwrite . .12 Narrow-band signal-to-noise ratio (NB SNR) .12 Peak shift . 13 Quality of tape . .13 Dropout . .13 Coinciden
17、t dropout . . 4 Durability of tape . .I4 Mechanical specifications of the tape cartridge . .14 Label areas of cartridge case . .20 Locating areas of cartridge case . 21 i Page 8.3 Flexibility of cartridge case .21 8.4 File-protect mechanism .24 8.5 Tape-reel hub .24 8.6 Metallic insert .24 8.7 Brake
18、 mechanism .25 8.8 Winding of tape . .25 8.9 Winding tension . .26 8.10 Circumference of tape reel . .26 8.1 1 Moment of inertia of tape reel .26 8.12 Leader block tape attachment .26 8.13 Leader block pickup position .26 8.14 Leader block insertion force . .26 8.15 Leader block pull-out force and w
19、ork .27 8.16 Inhibitor cartridge .27 8.17 Cartridge case colors . .27 9 Format of track .27 9.1 Number of tracks . .27 9.2 Reference edge of tape . .27 9.3 Positions of track . .27 9.4 Width of track .28 9.5 Azimuth . .28 10 Data integrity test .28 10.1 Requirement .28 10.2 Procedure .29 Tables 1 Ke
20、y to figures 6 to 15 . .22 2 Angle dimensions for figures 6 to 15 .24 3 Track centerline locations .29 Figures 1 2 3 4 5 6 7 8 9 10 11 12 13 Tape resistance measurement electrodes .9 Tape resistance measurement circuit . .9 Ferrite wear bar . .10 Wear-bar holding fixture . .I1 Typical wear-bar wear
21、pattern .l 1 Top and ends of tape cartridge .15 Bottom and side of tape cartridge . .I6 Gear tooth profile . .17 Hub bottom view .17 Cross-section view of cartridge in hand .18 Cross-section view of cartridge in machine . .18 Leader block seated in cartridge .I9 Leader block tape attachment .19 ii P
22、age 14 Leader block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 15 Cross-section of leader block opening . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
23、. . . . . . . . . . 21 16 Tape cartridge assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 17 Usable recording area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
24、. . . . . . . . . . . . . . . . . . . . . . . 28 Annexes A A.1 A.2 B 6.1 B.2 8.3 C c.1 c.2 D D.l D.2 E E.l E.2 F F.l F.2 Pre-record condition .30 Explanation . .30 Procedure .30 Measurement of peak shift . .31 Read equipment .31 Measurement . .31 Data analysis . .31 Recommendations for transportatio
25、n .33 Environment .33 Hazards . .33 Tape durability . .34 Short-length durability and reliability test .34 Long-length durability and reliability test .34 Description of media identification label . .35 Bar code information .35 Reflectivity .35 Alternate cupping test procedure .39 Definition . .39 P
26、rocedure .39 G Bibliography . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 . . . III _ _._ ._-I_-_ - . _.- I - .- - -. - -. .- Foreword (This foreword is not part of American Nat
27、ional Standard X3.265-1995.) This standard presents physical and magnetic requirements for 12.57-mm (0.495inch), 36-track magnetic tape cartridge to be used for information interchange among processing systems, communication systems, and associated equipment. The X3B5 Subcommittee on Digital Magneti
28、c Tape, which developed this standard, consists of experienced and qualified specialists on manufacturing magnetic tape, and on recording digital information on magnetic tape. This standard supports the recording density of 1944 ftpmm (49 378 ftpi) and complements American National Standard for info
29、rmation 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, ANSI X3.180-1990, and international Standard for Information processing - Data interchange on 12.7 mm (0.5 in) wide m
30、agnetic tape car- tridges - 18 tracks, 1491 data bytes per millimetre (37 871 data bytes per inch), IS0 9661:1988. The cartridge, magnetic tape, and recording format represent a significant advancement in reliability and volumetric efficiency for 12.57-mm (0.495inch) magnetic tape. In the developmen
31、t of this stan- dard, careful consideration was given to current practices, existing equip- ment and supplies, the broadest possible acceptance, and to providing a basis for future improvements in the use of the cartridge medium. The standard contains specifications for the physical, magnetic, and p
32、er- formance properties of the magnetic media, and the dimensions and char- acteristics of the cartridge. This standard includes a number of new criteria that are the result of experi- ences obtained in high-density recording on magnetic tape. As additional experience is gained, improvement in test
33、methods and the need for addi- tional criteria should be expected. This is particularly relevant in the areas of mechanical interaction between the magnetic tape and the recording head. There are seven annexes to this standard. Annexes A and B are normative. Annexes C through G are informative and n
34、ot considered part of this standard. Requests for interpretation, 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, Suite 200, Washington, DC 20005. This standard was process
35、ed and approved for submittal to ANSI by Accredited Standards Committee on Information Technology, X3. Committee approval of the standard does not necessarily imply that all members voted for its approval. At the time it approved this standard, the X3 Committee had the following members: James D. Co
36、nverse, Chair Donald C. Loughry, Vice-Chair Joanne Flanagan, Secretary Organization Represented Name of Representative American Nuclear Society . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Geraldine C. Main Sally Hartzell (AIL) AMP, Inc . . . .
37、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Edward Kelly Charles kill (Alt.) iv Organization Represented Name of Representative Apple Computer, Inc David K. Michael ATa;c;W Norris Huse Toshiaki lzumi Ky
38、riacos Joannou Clayton Johnson John S. Judge Richard L. Kelly Ali Khorsandian David R. Lennox Robert Lutz Jack L. Maynard William Mealey Eddie T. Morioka Curt Mulder John Neumann Gerrit Nijssen Ted Oikawa Charles Rainey Cam Schweitzer Matt Smith Travis N. Smith Colin Takatori Pravin Trivedi David M.
39、 Wilson Kirk D. Wilson James W. Wolf Bruce Behymer (Alt.) David Berry (Alt.) Anthony Bova (Alt.) Robert W. Brillhart (Alt.) Ken Brown (Alt.) Bill Bullers (Alt.) James U. Chesnutt (Alt.) Edward Clark (Alt.) Richard F. bavis (Alt.) Elizabeth R. Dessuge (Alt.) Thomas A. Dindinger (Alt.) David J. Donald
40、 (Alt.) Larry P. Dunn (Alt.) Gene Edstrom (AIL) Jerry Ganske (Alt.) Munechika Gomi (Alt.) Brian Gustard (Alt.) Poshihiko Hamada (Alt.) Norikazu Horikawa (Alt.) David Hudson (Alt.) Tim Hughes (Alt.) Paul D. Jahnke (Alt.) Richard J. Jooss (Alt.) George Klechefski (Alt.) Frank Kramer (Alt.) John Mansue
41、to (Alt.) George McBride (Alt.) Brian McDonald (Alt.) Dave McFarland (Alt.) Tatsuya Miyazaki (Alt.) Alan Montgomery (Alt.) Donald E. Morgan (Alt.) Kevin Morse (Alt.) Kenneth G. Neimiller (Alt.) Mark Okafuji (Alt.) David M. Potter (Alt.) Kerry Rester (Ah.) Michael H. Riddle (Alt.) C. Patrick Shannon
42、(Alt.) John C. Shovic (Alt.) Martin Singer (Alt.) Jun Takayama (Alt.) Gerald Taylor (Alt.) Whittington P. Vara (Alt.) Ronald Weiss (Alt.) Wayne Wilson (Alt.) Kei Yamashita (Alt.) James Ye (Alt.) Evan Ypsilantis (Alt.) Joseph S. Zajaczkowski (Alt.) Pete Zakit (Alt.) Hossein Zeinali (Alt.) AMERICAN NA
43、TIONAL STANDARD American National Standard for Information Technology - ANSI X3.265-l 995 Magnetic Tape and Cartridge for Information Interchange - Unrecorded, 36-track, Parallel, 12.57 mm (0.495 in), 1944 ftpmm (49 378 ftpi) Group-Coded Recording 1 Scope, purpose, and application 1.1 Scope This sta
44、ndard provides the requirements for an unrecorded tape cartridge to be used for information interchange among information-processing systems. Such a cartridge comprises two parts: - a case to provide protection of the media from contaminants and human handling, and to facilitate loading and unloadin
45、g of the cartridge by the drive; - a magnetic tape of 12.573 mm (0.495 in) width held inside the case on a reel. The tape shall be transported on the reel for digital recording at a physical density of 1944 ftpmm (49 378 ftpi). 1.2 Purpose The purpose of this standard is to define the requirements a
46、nd supporting test methods necessary to ensure information interchange at acceptable performance levels. It is distinct from a specification in that it delineates a minimum of restrictions consistent with compatibility in interchange transactions. The performance levels contained in this standard re
47、present 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 crite- ria for interchange purposes. The performance levels in this
48、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 quantitative limits for requirements falling within the
49、 scope of this standard are not stated but left to agreement between the interchange par- ties, standard test methods and measurement procedures shall be used to determine such limits. The interchange parties complying with the applicable standards should be able to achieve com- patibility without the need for additional exchange of technical information. 1.3 Application 1.3.1 Conformance A magnetic tape cartridge conforms to this standard if it satisfies all requirements of this standard. The tape requirements shall be satisfied throughout the extent of the tape. 1.3.2 Dimensions
