1、BRITISH STANDARD BS 7080-1: 1989 ISO 8462-1: 1986 Guide to Construction and use of6.30mm (0.25in) magnetic tape cartridge for data interchange, using GCR recording at394ftpmm (10000ftpi),39cpmm (1000cpi) Part 1: Mechanical, physical and magnetic properties ISO title: Information processing Data inte
2、rchange on6,30mm (0.25in) magnetic tape cartridge using GCR recording at394ftpmm (10000ftpi),39cpmm (1000cpi) Part1: Mechanical, physical and magnetic properties UDC 681.327.636:006.015.3:681.2.087.004.12:001.4:620.1BS7080-1:1989 This British Standard, having been prepared under the directionof the
3、Information Systems Technology Standards Policy Committee, was publishedunder the authority ofthe Board of BSI and comes intoeffect on 30June1989 BSI 12-1999 The following BSI references relate to the work on this standard: Committee reference IST/4 Draft for comment 84/63329 DC ISBN 0 580 17189 2 C
4、ommittees responsible for this British Standard 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 Br
5、itish Computer Society British Telecommunications 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 In
6、stitute of Quality Assurance Institution 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 CommentsBS7080-1:1989 BSI 12-1999 i Contents Page C
7、ommittees responsible Inside front cover National foreword ii 1 Scope and field of application 1 2 Conformance 1 3 Reference 1 4 Definitions 1 5 Environment and transportation 2 6 Characteristics of the tape 3 7 Characteristics of the cartridge 5 Annex A Measurement of light transmittance 24 Annex B
8、 Layer-to-layer adhesion 28 Annex C Instantaneous speed variation 28 Annex D Tape tension 31 Annex E Electrical resistance of the belt capstan 33 Figure 1 Position of the markers and recording areas (magnetic surfaceshown) 8 Figure 2 Cartridge diagram 9 Figure 3 Cartridge dimensions 10 Figure 4 Cart
9、ridge locating planes 12 Figure 5 Light sensing 14 Figure 6 File protect and cartridge-in-position sensing 16 Figure 7 Cartridge door profile 18 Figure 8 Label area 20 Figure 9 Tape path and drive dimensions 22 Figure 10 Measuring device 26 Figure 11 Measuring mask 27 Figure 12 Test for layer-to-lay
10、er adhesion 28 Figure 13 Standard loop 30 Figure 14 Suppression function 30 Figure 15 Maximum allowable ISV 31 Figure 16 Test rod 32 Figure 17 Test fixture 33 Table Dimensions of the rod 32 Publications referred to Inside back coverBS7080-1:1989 ii BSI 12-1999 National foreword This Part of BS7080,
11、prepared under the direction of the Information Systems Technology Standards Policy Committee, is identical with ISO8462-1:1986 “Information processing Data interchange on6,30mm (0.25in) magnetic tape cartridge using GCR recording at394ftpmm (10000ftpi),39cpmm (1000cpi) Part 1: Mechanical, physical
12、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 to writing comple
13、te 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 the ISO Directives, or in BS0-3, but the BSI Technical Committee considers the text is useful as a guide when car
14、tridges 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 specification and, in par
15、ticular, no claims of compliance with this British Standard should be made. Terminology and conventions. The text of the International Standard has been approved as suitable for publication as a British Standard without deviation. Some terminology and certain conventions are not identical with those
16、 used in British Standards; attention is drawn especially to the following. For metric units the comma has been used as a decimal marker. In British Standards it is current practice to use a full point on the baseline as the decimal marker. Wherever the words “ISO8462-1” or “Part of ISO8462” appear,
17、 referring to this standard, they should be read as “Part of BS7080”. Where the words “ISO8462” appear they should be read as “BS7080”. 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.
18、 Compliance with a British Standard does not of itself confer immunity from legal obligations. Cross-references International Standard Corresponding British Standard ISO 8462-2:1986 BS 7080 Guide to construction and use of6.30mm (0.25in) magnetic tape cartridge for data interchange, using GCR record
19、ing at394ftpmm (10000ftpi),39cpmm (1000cpi) Part 2:1989 Streaming mode Summary of pages This document comprises a front cover, an inside front cover, pagesi andii, pages1 to34, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments inco
20、rporated. This will be indicated in the amendment table on the inside front cover.BS7080-1:1989 BSI 12-1999 1 1 Scope and field of application ISO 8462 specifies the characteristics of a tape cartridge loaded with magnetic tape6,30mm(0.25in) wide intended for digital recording at physical recording
21、densities of252ftpmm (6400ftpi) and394ftpmm(10000ftpi). ISO 8462-2 specifies a recording method and a data format intended for use in the streaming mode of operation. Two alternative track formats are specified: a 4-track format, and a 9-track format. This part of ISO8462 specifies the mechanical, p
22、hysical and magnetic properties of a6,30mm(0.25in) wide magnetic tape cartridge and methods for testing the surface quality of the tape. It also specifies the environmental conditions under which the cartridge shall be tested and operated, and recommends conditions for storage. ISO 8462-1 and ISO846
23、2-2 provide for the physical interchange of cartridges between data processing systems, and specify a data format. A labelling standard for tape cartridges used in the streaming mode is under study. The availability of such a labelling standard will provide for full data interchange between data pro
24、cessing systems. NOTENumeric values in the SI and/or Imperial measurement system in this part of ISO8462 may have been rounded off and therefore are consistent with, but not exactly equal to, each other. Either system may be used, but the two should be neither intermixed nor reconverted. The origina
25、l design was made using the imperial measurement system. 2 Conformance A 6,30 mm (0.25in) wide magnetic tape cartridge shall be in conformance with ISO8462 if it meets either all mandatory requirements of both ISO8462-1 and ISO8462-2 specified for the4-track format or all mandatory requirements of b
26、oth ISO8462-1 and ISO8462-2 specified for the9-track format. The two formats shall not exist on the same cartridge. 3 Reference ISO 8462-2, Information processing Data interchange on6,30mm (0.25in) magnetic tape cartridge using GCR recording at394ftpmm (10000ftpi),39cpmm (1000cpi) Part2:Streaming mo
27、de. 4 Definitions For the purpose of this International Standard 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 tape ca
28、rtridge 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 field which
29、, 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 signal out
30、put at the test density 4.6 test recording currents the two recording current between 148% and152% of the current required to produce the Reference Field at252ftpmm (6400ftpi), and between 128% and132% of the current required to produce the Reference Field at394ftpmm (10000ftpi). 4.7 signal amplitud
31、e reference tape cartridge a reference tape cartridge selected as a standard for signal amplitude and reference 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-pea
32、k signal amplitudes when recorded at 252 ftpmm (6400ftpi); 394 ftpmm (10000ftpi). Secondary Standard Amplitude Reference Tape Cartridges are available from NBS under Part Number SRM3217 1) . 1) NBS, Office of Standard Reference Materials, Room311, Chemistry Building, Gaithersburg, MD20899, USA.BS708
33、0-1:1989 2 BSI 12-1999 4.8 standard reference amplitude (SRA) the average peak-to-peak signal amplitudes of the Signal Amplitude Reference Tape Cartridge. These signal amplitudes shall be averaged over10000flux transitions SRA 252is the average peak-to-peak signal amplitude when recording at252ftpmm
34、 (6400ftpi) using the appropriate Test Recording Current SRA 394is the average peak-to-peak signal amplitude when recording at394ftpmm (10000ftpi) using the appropriate Test Recording Current 4.9 average signal amplitude the average peak-to-peak value of the signal output measured over at least8000
35、consecutive flux transitions 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 re
36、corded flux transitions 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 that
37、 position which exhibits the maximum free space flux density normal to the tape surface 4.15 reference alignment tape cartridge a tape cartridge containing a tape on which continuous information has been recorded a Reference Alignment Tape Cartridge is optimized for perpendicularity of the written f
38、lux transitions to the cartridge positioning plane 4.16 recording area that part of the tape satisfying the requirements for magnetic properties 4.17 erasing field a field of sufficient strength to remove the signals from the tape 5 Environment and transportation 5.1 Testing environment Tests and me
39、asurements made on the cartridge to check the requirements of this part of ISO8462 shall be carried out under the following conditions: temperature:23 2 C (73 4 F); relative humidity: 40% to60%; conditioning before testing:24hmin. wet-bulb temperature:18Cmax. (64Fmax.) 5.2 Operating environment Cart
40、ridges used for data interchange shall be operated under the following conditions: temperature: 5 to45 C (41 to113 F); relative humidity:20% to80% wet-bulb temperature:26Cmax. (79Fmax.) The temperature shall be measured in the air immediately surrounding the cartridge. Rapid temperature variations s
41、hould 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 to45 C (41 to113 F); relative humidity:20% to80%; wet-bulb temperature:26Cmax. (7
42、9Fmax.) 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 to45 C (40 to113 F); relative humidity:20% to80%;
43、wet-bulb temperature:26Cmax. (79Fmax.)BS7080-1:1989 BSI 12-1999 3 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. Th
44、e final 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
45、 the 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 be conditioned by running the tape one complete end-to-e
46、nd pass in any of the following cases: a) each time it is inserted in a drive; b) after prolonged operation over a limited area; c) when the temperature change to which the cartridge has been exposed is greater than17 C (30 F). 5.6 Flammability Tape or cartridge components shall be made from materia
47、ls 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 Characteristics of the tape 6.1 Mech
48、anical properties 6.1.1 Tape width The width of the tape shall be 6,30mm (0.2470in) 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) shall be 137,
49、0m (450ft) 6.1.3 Tape thickness The thickness of the tape and of its coating shall be overall thickness:194m max. (0.00075 in max.) coating thickness:6,64m max. (0.00026 in max.) 6.1.4 Markers In the tape there shall be a number of markers, the relative positions of which are shown inFigure 1. 6.1.4.1 Beginning-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
