ANSI INCITS 197-1991 Information Systems - Unrecorded Magnetic Tape and Cartridge for Information Interchange - 1 2 inch (12.65 mm) Serial Serpentine 22-Track 6 667 ftpi (262 ftpmm.pdf

1、ANSI INCITS 197-1991 (R2002) (formerly ANSI X3.197-1991 (R1996)for Information Systems Unrecorded Magnetic Tape and Cartridgefor Information Interchange l/2 inch (12.65 mm), Serial Serpentine,22-Track, 6 667 ftpi (262 ftpmm)and 48-Track, 10 000 ftpi (394 ftpmm)ANSI x3.197-1991 American National Stan

2、dard for Information Systems - Unrecorded Magnetic Tape and Cartridge for Information Interchange - l/2 inch (12.65 mm), Serial Serpentine, 22-Track, 6 667 ftpi (262 ftpmm) and 48-Track, IO 000 ftpi (394 ftpmm) Secretariat Computer and Business Equipment Manufacturers Association Approved March 29,

3、1991 American National Standards Institute, inc. AmericanNationalStandardApproval of an American National 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 ju

4、dgment of the ANSI Board of StandardsReview, substantial agreement has been reached by directly and materiallyaffected interests. Substantial agreement means much more than a simplemajority, but not necessarily unanimity. Consensus requires that all views andobjections be considered, and that a conc

5、erted effort be made toward theirresolution.The use of American National Standards is completely voluntary; 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 c

6、onforming to the standards.The American National Standards Institute does not develop standards and will inno 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

7、 name of the American National StandardsInstitute. Requests for interpretations should be addressed to the 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 America

8、n National StandardsInstitute require that action be taken periodically to reaffirm, revise, or withdrawthis standard. Purchasers of American National Standards may receive currentinformation on all standards by calling or writing the American National StandardsInstitute.Published byAmerican Nationa

9、l Standards Institute11 West 42nd Street, New York, New York 10036Copyright 1992 by Information Technology 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

10、Eye Street NW,Washington, DC 20005.Printed in the United States of AmericaContents Page Foreword ii 1 Introduction 1 2 Normative references .2 3 Definitions . .2 4 Environment and safety 3 5 Tape mechanical and electrical requirements 4 6 Tape magnetic-recording performance . .8 7 Tape quality . IO

11、8 Mechanical specifications of the tape cartridge . .lO Table 1 Dimensions (English and metric) for figures . 26 Figures 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 Description of angle theta 6 Figure of peak shift measurement . 9 Tape cartridge . 12 Drawing coordinate system 13 Position of cartrid

12、ge leader . .I4 Tape/leader exit angles . 15 Cartridge-bottom view 16 Reel locks and notches . .17 Cartridge-side view . 18 Cartridge-cross section 19 Cartridge-operating position . . . .20 Cartridge leader . . . .21 . Cartridge reel assembly . .22 Tape resistance measurement electrodes 23 Tape resi

13、stance measurement circuit . 24 Alfesil wear bar . .:. . .24 Wear bar holding fixture . . . . . 25 Typical wear pattern . 25 Annexes A Recommendations for transportation .36 B Tape dropouts 37 C Pre-record condition . 38 Foreword (This foreword is not part of American National Standard X3.1 97-1991.

14、) This standard presents the minimum requirements for the physical and magnetic interchangeability of I/2 in. (12.65 mm) wide magnetic tape in a cartridge to be used for information processing systems and associated equipment utilizing a standard code for information interchange. This standard compl

15、ements ANSI X3.181-1990, American National Standard for Information Systems - Recorded Magnetic Tape and Cartridge for Information Interchange, I/2 in. (12.65 mm), Serial Serpentine, 22-Track, 6 667 bpi (262 bpmm) and 48-Track, IO 000 bpi (394 bpmm), MFM Recording. This standard evolved from a need

16、for a compact l/2 in. (12.65 mm) tape car- tridge for use in small form factor magnetic tape drives. This was accomplished by winding 600 feet (183 meters) of I/2 in. (12.65 mm) wide magnetic tape onto a reel inside of a small (4 in. by 4 in. by 1 in.) self-loading cartridge. The result is a I/2 in.

17、 (12.65 mm) tape cartridge media which facilitates the design of high capacity, small form factor magnetic tape drives. The X3B5 Technical Committee on Digital Magnetic Tape, which developed this standard, consists of a number of experienced and qualified specialists on the recording of digital info

18、rmation on magnetic tape. In the development of this standard, careful consideration was given to current practices, existing equip- ment and supplies and the broadest possible acceptance, and to providing a basis for future improvement in the use of the medium. This standard was approved as an Amer

19、ican National Standard on March 29, 1991. Suggestions for the improvement of this standard will be welcome. They should be sent to the Computer and Business Equipment Manufacturers Association, 31 I First Street, NW, Suite 500, Washington, DC 20001. This standard was processed and approved for submi

20、ttal to ANSI by Accredited Standards Committee on Information Processing Systems, X3. Committee approval of the 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: Richard Gibson, Ch

21、air Donald C. Loughry, Vice-Chair Joanne Flanagan, Administrative Secretary Organization Represented Name of Representative Allen-Bradley Co . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Ronald Reimer Joe Lenner (Alt.) American

22、Library Association . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Paul Peters American Nuclear Society . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Geraldine C. Main Sally Hartzell (AIL) AMP incorporated . . . . . .

23、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Edward Kelly Edward Mikoski (Ah.) Apple Computer Inc. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Karen Higginbottom Association of the Insti

24、tute for Certification of Computer Professionals (AICCP) . . Kenneth Zemrowski Eugene Dwyer (Alt.) ATA hole on the centerline of the tape at the end farthest from the leader. 3.8 magnetic tape: A tape that accepts and retains magnetic signals intended for input, output, and storage of data for infor

25、ma- tion processing 3.9 master standard reference tape: A tape selected as the standard for reference field, signal amplitude, resolution, peak shift, and overwrite. NOTE-A master standard reference tape is being established at the National Institute of Standards and Technology (NISI) for this stand

26、ard. 3.10 overwrite: The ratio of the average signal amplitude of the residual of the 1 F recording frequency, after being overwritten ) Available from American National Standards Institute, 11 West 42nd Street, New York, NY 10036 2 ANSI X3.1 97-1991 by the 2F recording frequency, to the average sig

27、nal amplitude of the original 1 F recording frequency. 3.11 peak shift: The time displacement of adjacent read-back signal peaks from the cor- responding written timing. 3.12 physical recording density: The number of recorded flux transitions per unit length of track, e.g., flux transitions per inch

28、 (ftpi) or flux transitions per millimeter (ftpmm). 3.13 pre-record condition: The required remanent moment of the tape prior to record- ing data or testing. 3.14 recording frequency: The frequency of the flux transitions on the tape resulting from a specific data pattern The 2F frequency is produce

29、d by the all ONES or the all ZEROS pattern. The 1F frequency is produced by the 0101010101. pattern. 3.15 recording mode A: A mode of opera- tion in which the 2F physical recording density is equal to 6 667 ftpi (262 ftpmm) and the 1F physical recording density is equal to 3 333 ftpi (131 ftpmm). 3.

30、16 recording mode B: A mode of opera- tion in which the 2F physical recording density is equal to 10 000 ftpi (394 ftpmm) and the 1 F physical recording density is equal to 5 000 ftpi (197 ftpmm). 3.17 reference field: The typical field of the master standard reference tape. 3.18 resistance per squa

31、re: The surface resistance of a square area, of any size, mea- sured between electrodes placed on two opposite sides of the square. The unit of mea- surement is the ohm. 3.19 resolution: The ratio of the average signal amplitude at the 2F physical recording density to that at the 1F physical recordi

32、ng density. 3.20 secondary standard reference tape: A tape the performance of which is known and stated in relation to that of the master stan- dard reference tape. NOTE - Secondary standard reference tapes for this standard are being developed at the National Institute of Standards and Technology (

33、NIST), and will be available from the NIST Office of Standard Reference Materials, Room 8311, Chemistry Building, National Institute of Standards and Technology, Gaithersburg, MD 20899. It is intended that these be used for cali- brating further reference tapes for use in routine calibration. 3.21 s

34、tandard measurement current (I,): Is 1.5 times the standard reference current (I,). (I, = 1.5 x I,). 3.22 standard reference amplitude: The average signal amplitude from the master standard reference tape when it is recorded with the standard measurement current on the NIST measurement system at the

35、 2F physical recording density. Traceability to the standard reference amplitude is provided by the calibra- tion factors supplied with each secondary standard reference tape. 3.23 standard reference current (I,): Is the current that produces the reference field. 3.24 track: A longitudinal area on t

36、he tape along which a series of magnetic signals can be recorded. 3.25 typical field: The minimum recording field, which, when applied to the magnetic tape under test, will cause an average signal amplitude equal to 95 percent of the maximum average signal amplitude at the selected 2F physical recor

37、ding density. 4 Environment and safety Unless otherwise stated, the conditions speci- fied below refer to the ambient conditions in the test or computer room and not to those within the tape equipment. 4.1 Cartridge and tape testing environment Unless otherwise stated, tests and measure- ments made

38、on the cartridge and tape to check the requirements of this standard shall be carried out under the following conditions: - Temperature: 73F a 4F (23C + 2C) - Relative humidity: 40% to 60% 4.1 .l Conditioning before testing The cartridge shall be exposed to the testing environment for 24 hours. 4.2

39、Cartridge operating environment Cartridges used for data interchange shall be capable of operating under the following con- ditions: 3 ANSI X3.1 97-1991 - Ambient temperature: 50F to 120F strong yet flexible layer of ferromagnetic (10C to 48C) material dispersed in a suitable binder. The CAUTION - L

40、ocalized tape temperatures in other surface of the tape shall be coated with excess of 120F (48C) may cause tape damage. a nonmagnetic coating. 5.2 Tape length - Relative humidity: 20% to 80% - Maximum wet bulb temperature:-78F (25C) Conditioning before operating: If during stor- age and/or transpor

41、tation a cartridge has been exposed to conditions outside the above val- ues, it shall be conditioned before use by exposure to the operating environment for a time equal to or greater than the time away from the operating environment. Conditioning times in excess of 24 hours are not required. 4.3 C

42、artridge storage environment Cartridges shall be stored under the following conditions: The tape length between the BOT and EOT holes shall be 625 feet * 5 feet (190.5 meters f 1.5 meters). Additional requirements are shown in figure 13. 5.3 Width The width of the tape shall be 0.4980 inch f 0.0010

43、inch (12.650 mm f 0.025 mm). The width shall be measured across the tape from edge to edge when the tape is under a tension of less than 1.0 ozf (0.28 N). 5.4 Total thickness - Temperature. 60F to 90F (16C to 32C) The total thickness of the tape at any point shall be between 980 pin (24.9 pm) and 11

44、00 l.un (27.9 pm). - Relative humidity: 20% to 80% - Maximum wet bulb temperature: 80F (26C) 5.5 Base-material thickness The thickness of the base material shall be 850 win (21.6 vrn) nominal. 5.6 Discontinuity 4.4 Transportation There shall be no discontinuities in the tape Recommendations for tran

45、sportation appear in between the BOT and EOT markers such as annex A. those produced by tape splicing or perfora- tions. 4.5 Safety 4.5.1 Safeness 5.7 Longitudinal curvature The components of the tape and cartridge Longitudinal curvature is the departure of the assembly shall not constitute any safe

46、ty or reference edge of the tape from a straight line health hazard when used in the intended man- along the longitudinal dimension of the tape in the plane of the tape surface. ner, or through any foreseeable misuse in an information processing system. 5.7.1 Requirement Any deviation of the referen

47、ce edge from a straiaht line must be aradual and shall not 4.5.2 Flammability The materials used in the external cartridge exce;d f 0.0015 inch G.04 mm) within a 9.0 covers shall have a flammability rating of at inch (229 mm) span of tape. least 94V-2, as described in ANSWL 94. 5.7.2 Procedure Measu

48、re at a tension of 5.0 ozf +- 1 .O ozf (1.39 5 Tape mechanical and electrical N f 0.28 N) in a test fixture equipped with two requirements guides spaced at 9.0 inches (229 mm). The two guides shall be spring loaded to position 5.1 Material the reference edge of the tape against two edge control surf

49、aces. Measure the maximum The tape shall consist of a base material (ori- deviation of the reference edge of the tape ented polyethylene terephthalate film or its from the line drawn between the two control equivalent) coated on one surface with a surfaces. 4 ANSI X3.1 97-l 991 5.8 Out-of-plane distortions required to peel any part of the back coating Out-of-plane distortions are local deformations from the tape base material shall not be less that cause oortions of the tape to deviate from than 5.4 ozf (1.5 N). the plane of the surface ofthe tape. Out-of- 5.11.2