BS 7081-1-1989 Guide to construction and use of 6 30 mm (0 25 in) magnetic tape cartridge using IMFM for data interchange recording at 252 ftpmm (6400 ftpi) Mechanical physical and.pdf

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1、BRITISH STANDARD BS 7081-1: 1989 ISO 8063-1: 1986 Guide to Construction and use of6.30mm(0.25in) magnetic tape cartridge for datainterchange, usingIMFM recordingat252ftpmm (6400ftpi) Part1: Mechanical, physical and magnetic properties ISO title: Information processing Data interchange on6,30mm(0.25i

2、n) wide magnetic tape cartridge using IMFM recording at252ftpmm(6400ftpi) Part1: Mechanical, physical and magnetic properties UDC 681.327.636:006.015.3:681.2.087:004.12:001.4:620.1BS7081-1:1989 This British Standard, having been prepared under the direction of the Information Systems Technology Stan

3、dards Policy Committee, was published underthe authority of theBoardofBSI and comesintoeffecton 30 June1989 BSI 01-2000 The following BSI references relate to the work on this standard: Committee reference IST/4 Draft for comment84/63327 DC ISBN 0 580 17209 0 Committees responsible for this BritishS

4、tandard The preparation of this British Standard was entrusted by the Information Systems Technology Standards Policy Committee (IST/-) to Technical Committee IST/4, upon which the following bodies were represented: Association for Payment Clearing Services British Computer Society British Telecommu

5、nications plc Business Equipment and Information Technology Association Department of Trade and Industry (National Physical Laboratory) HM Customs and Excise HM Treasury (Central Computer and Telecommunications Agency) Institute of Administrative Management Institute of Quality Assurance Institution

6、 of Electrical Engineers Institution of Electronic and Radio Engineers Institution of Mechanical Engineers National Computing Centre Ltd. Post Office Amendments issued since publication Amd. No. Date of issue CommentsBS7081-1:1989 BSI 01-2000 i Contents Page Committees responsible Inside front cover

7、 National foreword ii 1 Scope and field of application 1 2 Conformance 1 3 References 1 4 Definitions 1 5 Environment and transportation 2 6 Characteristics of the tape 3 7 Layout of tracks 4 8 Characteristics of the cartridge 5 Annex A Measurement of light transmittance 24 Annex B Layer-to-layer ad

8、hesion 28 Annex C Instantaneous speed variation 29 Annex D Tape tension 32 Annex E Electrical resistance of the belt capstan 34 Annex F Defect density 34 Figure 1 Layout of tracks 5 Figure 2 Position of the markers and recording areas (magneticsurfaceshown) 8 Figure 3 Cartridge diagram 9 Figure 4 Ca

9、rtridge dimensions 10 Figure 5 Cartridge locating planes 12 Figure 6 Light sensing 14 Figure 7 File protect and cartridge-in-position sensing 16 Figure 8 Cartridge door profile 18 Figure 9 Label area 20 Figure 10 Tape path and drive dimensions 22 Figure 11 Measuring device 26 Figure 12 Measuring mas

10、k 27 Figure 13 Test for layer-to-layer adhesion 28 Figure 14 Standard loop 30 Figure 15 Suppression function 31 Figure 16 Maximum allowable ISV 31 Figure 17 Test rod 33 Figure 18 Test fixture 34 Table Dimensions of the rod 33 Publications referred to Inside back coverBS7081-1:1989 ii BSI 01-2000 Nat

11、ional foreword This Part ofBS7081, prepared under the direction of the Information Systems Technology Standards Policy Committee, is identical withISO8063-1:1986 “Information processing Data interchange on6,30mm(0.25in) wide magnetictape cartridge using IMFM recording at252ftpmm(6400ftpi) Part1: Mec

12、hanical, physical and magnetic properties” published by the International Organization for Standardization (ISO). The purpose of this standard is to define those characteristics necessary for successful data interchange using magnetic tape cartridges. The information contained is intended as a guide

13、 to writing complete specifications for manufacture, purchasing and/or testing. The text of the International Standard does not accord with the recommendations for drafting product specifications given in theISODirectives, or inBS0-3, but the BSI Technical Committee considers the text is useful as a

14、 guide when cartridges are being described or specified. For this reason this British Standard has a different title from the International Standard; it is issued as a British Standard guide and it should only be used as such. It should not be used on its own as a British Standard product specificat

15、ion and, in particular, no claims of compliance with this British Standard should be made. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not

16、of itself confer immunity from legal obligations. Cross references International Standard Corresponding British Standard ISO 646:1983 BS 4730:1985 Specification for UK7-bit coded character set (Identical, exercising national options) ISO 2022:1986 BS 6856:1987 Specification for code extension techni

17、ques for UnitedKingdom7-bit and8-bit coded character sets (Identical) ISO 4341:1978 BS 5769 Specification for magnetic tape cassette and cartridge labelling and file structure, for information interchange Part1:1979 Label standard version1 (Identical) ISO 4873:1986 BS 6006:1987 Specification for str

18、ucture and rules for implementation of UnitedKingdom8-bit coded character set (Identical) ISO 8063-2:1986 BS 7081 Guide to construction and use of6.30mm(0.25in) magnetic tape cartridge for data interchange using IMFM recording at252ftpmm(6400ftpi) Part2:1989 Track format and method of recording for

19、data interchange in start/stop mode (Identical) Summary of pages This document comprises a front cover, an inside front cover, pagesi andii, pages1 to36, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be

20、indicated in the amendment table on the inside front cover.BS7081-1:1989 BSI 01-2000 1 1 Scope and field of application ISO8063 specifies the characteristics of a tape cartridge using6,30mm(0.25in) wide magnetic tape for data interchange between data processing systems. ISO8063-2 specifies the quali

21、ty of the recorded signals, and the track format to be used on a6,30mm(0.25in) magnetic tape cartridge recorded at252ftpmm(6400ftpi) using IMFM recording and the start/stop mode of operation. This part ofISO8063 specifies the dimensional, physical and magnetic characteristics of the cartridge, and t

22、he track layout. Together with the labelling scheme specified inISO4341,ISO 8063-1 andISO8063-2 provide for full data interchange between data processing systems. NOTENumeric values in theSI and/or Imperial measurement system in this part ofISO8063 may have been rounded off and therefore are consist

23、ent with, but not exactly equal to, each other. Either system may be used, but the two should be neither intermixed nor reconverted. The original design was made using the Imperial measurement system. ISO8063 applies to cartridges used for data interchange. Where it applies for testing only, this is

24、 specifically stated. 2 Conformance A6,30mm(0.25in) wide magnetic tape cartridge shall be in conformance withISO8063 if it meets all mandatory requirements of bothISO8063-1 andISO8063-2. 3 References ISO 646, Information processing ISO7-bit coded character set for information interchange. ISO 2022,

25、Information processing ISO7-bit and8-bit coded character sets Code extension techniques. ISO 4341, Information processing Magnetic tape cassette and cartridge labelling and file structure for information interchange. ISO 4873, Information processing ISO8-bit code for information interchange Structur

26、e and rules for implementation. 4 Definitions For the purpose ofISO8063 the following definitions apply. 4.1 magnetic tape a tape which accepts and retains magnetic signals intended for input/output and storage purposes of information processing and associated systems 4.2 reference tape cartridge a

27、tape cartridge selected for a given property for calibrating purposes 4.3 secondary reference tape cartridge a tape cartridge intended for routine calibrating purposes, the performance of which is known and stated in relation to that of the reference tape cartridge 4.4 typical field the minimum fiel

28、d which, when applied to the tape under test, causes a signal output equal to95% of the maximum signal output at the specified test density 4.5 reference field the minimum field which, when applied to the signal amplitude reference tape cartridge, causes a signal output equal to95% of the maximum si

29、gnal output at the test density 4.6 test recording current the recording current between148% and152% of the current required to produce the reference field at252ftpmm(6400ftpi) 4.7 signal amplitude reference tape cartridge a reference tape cartridge selected as a standard for signal amplitude and re

30、ference field NOTEA Master Standard (Computer Amplitude Reference) Cartridge has been selected by the US National Bureau of Standards (NBS) to establish the reference level for average peak-to-peak signal amplitudes when recorded at 252 ftpmm(6400 ftpi), 394 ftpmm(10000 ftpi). Secondary Standard Amp

31、litude Reference Tape Cartridges are available from NBS under Part Number SRM3217. 1) 1) NBS, Office of Standard Reference Materials, Room311, Chemistry Building, Gaithersburg, M.D.20899, USA.BS7081-1:1989 2 BSI 01-2000 4.8 average signal amplitude the average peak-to-peak value of the signal output

32、 measured over at least4000 flux transitions 4.9 standard reference amplitude (SRA) the average peak-to-peak signal amplitudes of the Signal Amplitude Reference Tape Cartridge SRA 252is the average peak-to-peak signal amplitude when recording at252ftpmm(6400ftpi) using the appropriate Test Recording

33、 Current 4.10 in-contact an operating condition in which the magnetic surface of a tape is in physical contact with a magnetic head 4.11 track a longitudinal area of the tape along which a series of magnetic signals may be recorded 4.12 physical recording density the number of recorded flux transiti

34、ons per unit length of track: flux transitions per millimetre (ftpmm) flux transitions per inch (ftpi) 4.13 data density the number of data characters stored per unit length of tape; characters per millimetre (cpmm) characters per inch (cpi) 4.14 position of flux transitions the position which exhib

35、its the maximum free space flux density normal to the tape surface 4.15 erasing field a field of sufficient strength to remove the signals from the tape 4.16 recording area that part of the tape satisfying the requirements for magnetic properties 5 Environment and transportation 5.1 Testing environm

36、ent Tests and measurements made on the cartridge to check the requirements of this part ofISO8063 shall be carried out under the following conditions: temperature:23 2 C(73 4 F); relative humidity:40% to60%; wet-bulb temperature:18 C max.(64 F max.); conditioning before testing:24h min. 5.2 Operatin

37、g environment Cartridges used for data interchange shall be operated under the following conditions: temperature:5 to45C(41 to113 F); relative humidity:20% to80%; wet-bulb temperature:26 C max.(79 F max.); The temperature shall be measured in the air immediately surrounding the cartridge. Rapid temp

38、erature variations should be avoided. There shall be no deposit of moisture on or in the cartridge. 5.3 Storage environment During storage it is recommended that recorded cartridges are kept within the following conditions: temperature:5 to45C(41 to113 F); relative humidity:20% to80%; wet-bulb tempe

39、rature:26 C max.(79 F max.); 5.4 Transportation 5.4.1 Transportation environment During transportation, the cartridge may have been exposed to conditions outside the operating environment. It is recommended that the following conditions are not exceeded: temperature:40 C to45C(40 to113 F); relative

40、humidity:20% to80%; wet-bulb temperature:26 C max.(79 F max.). 5.4.2 Transportation procedures Responsibility for ensuring that adequate precautions are taken during transportation shall be with the sender. For transportation a rigid container free from dust or extraneous matter shall be used. The f

41、inal package shall have a clean interior and a construction preventing ingress of dust or water. It is recommended that a sufficient space exists between cartridge and outer surface of the final container, so that risk of damage due to stray magnetic fields will be negligible. 5.5 Conditioning of th

42、e cartridge Before use the cartridge shall be conditioned by exposure to the operating environment for a time at least equal to the period during which it has been out of the operating environment (up to a maximum of8h). The cartridge shall also be conditioned by running the tape one complete end-to

43、-end pass in any of the following cases: a) each time it is inserted in a drive; b) after prolonged operation over a limited area;BS7081-1:1989 BSI 01-2000 3 c) when the temperature change to which the cartridge has been exposed is greater than17C(30 F). 5.6 Flammability Tape or cartridge components

44、 shall be made from materials that, if ignited from a match flame, do not continue to burn in a still carbon dioxide atmosphere. 5.7 Toxicity Tape or cartridge components which may cause bodily harm by contact, inhalation or ingestion during normal use of the cartridge shall not be used. 6 Character

45、istics of the tape 6.1 Mechanical properties 6.1.1 Tape width The width of the tape shall be NOTEAlthough the tolerances are expressed differently in the two measurement systems, the dimensions are equivalent. 6.1.2 Tape length The length of the tape between the LP and the EW markers (see6.1.4) shal

46、l be 6.1.3 Tape thickness The thickness of the tape and of its coating shall be overall thickness:194m nom. (0.00075innom.) coating thickness:6,64m max. (0.00026inmax.). 6.1.4 Markers In the tape there shall be a number of markers, the relative positions of which are shown inFigure 2. 6.1.4.1 Beginn

47、ing-of-tape (BOT) A BOT marker shall be a pair of circular holes punched in the tape. There shall be three such markers, the innermost of which is used for the purpose of identifying the storage position for the cartridge. In the storage position, all of the recording area shall be wound on the supp

48、ly hub and shall be protected by at least one layer of tape. The two other markers shall be used to ensure reliability of detection. The diameter of the BOT holes shall be 1,17 0,05 mm(0.046 0.002 in). 6.1.4.2 End-of-Tape (EOT) An EOT marker shall be a single circular hole punched in the tape. There

49、 shall be three such markers along a single line. The first to pass the photo sensor during forward operation indicates that the recording area has been exceeded. The two other markers shall be used to ensure reliability of detection. The diameter of the EOT holes shall be 1,17 0,05 mm(0.046 0.002 in). 6.1.4.3 Load-Point (LP) The LP marker shall be a single circular hole punched in the tape to indicate the beginning of the recording area in the forward direction. The diameter of the LP