1、BRITISH STANDARD BS ISO 4057:1986 Implementation of ISO4057:1986 Information processing Datainterchange on6,30mm(0.25in) magnetic tape cartridge,63bpmm (1600bpi) phase-encodedBSISO 4057:1986 This BritishStandard, having been prepared under the directionof the Information Systems Technology Standards
2、 Policy Committee, was publishedunder the authority ofthe Standards Board and comesinto effect on 1April1992 BSI02-2000 The following BSI references relate to the work on this standard: Committee reference IST/4 Draft for comment88/60790 DC ISBN 0 580 20753 6 Committees responsible for this BritishS
3、tandard The preparation of this BritishStandard was entrusted by the Information Systems Technology Standards Policy Committee (IST/-) to Technical Committee IST/4, upon which the following bodies were represented: British Computer Society Her Majestys Stationery Office ICI Imagedata Institution of
4、Electrical Engineers International Computers Limited Kodak Limited National Computer Users Forum The following bodies were also represented in the drafting of the standard, through subcommittees and panels: British Telecommunications plc Department of Trade and Industry (IT Standards Unit) Digital E
5、quipment Co Ltd. HM Treasury (Central Computer and Telecommunications Agency) IBM United Kingdom Ltd. Information Systems Committee of the Universities Funding Council Level7 Ltd. Ministry of Defence Philips Research Laboratories Amendments issued since publication Amd. No. Date CommentsBSISO4057:19
6、86 BSI 02-2000 i Contents Page Committees responsible Inside front cover National foreword ii Foreword iii Text of ISO4057 1BSISO4057:1986 ii BSI 02-2000 National foreword This BritishStandard reproduces verbatim ISO4057:1986 and implements it as the UK national standard. This BritishStandard is pub
7、lished under the direction of the Information Systems Technology Standards Policy Committee whose Technical Committee IST/4 has the responsibility to: aid enquirers to understand the text; present to the responsible international committee any enquiries on interpretation, or proposals for change, an
8、d keep UK interests informed; monitor related international and European developments and promulgate them in the UK. NOTEInternational and European Standards, as well as overseas standards, are available from BSI Sales Department, BSI, Linford Wood, Milton Keynes, MK146LE. A British Standard does no
9、t 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 of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside f
10、ront cover, pages i and ii, theISO title page, pages ii to iv, pages1 to32 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.ISO4057:1986 (E) ii BSI 02-2000 Contents
11、Page Foreword iii 1 Scope and field of application 1 2 References 1 3 Definitions 1 4 Environment and transportation 2 5 Characteristics of the tape 3 6 Characteristics of the cartridge 4 7 Recording 6 8 Format 7 Annex A Measurement of light transmittance 28 Annex B Layer-to-layer adhesion 31 Annex
12、C Tape tension 31 Figure 1a) Position of the markers and recording areas (magneticsurfaceshown) 9 Figure 1b) Position of the markers and recording areas (magneticsurfaceshown) 10 Figure 2 Cartridge diagram 11 Figure 3a) Cartridge dimensions 12 Figure 3b) Cartridge dimensions 13 Figure 4a) Cartridge
13、locating planes 14 Figure 4b) Cartridge locating planes 15 Figure 5a) Light sensing 16 Figure 5b) Light sensing 17 Figure 6a) File protect and cartridge-in-position sensing 18 Figure 6b) File protect and cartridge-in-position sensing 19 Figure 7a) Cartridge door profile 20 Figure 7b) Cartridge door
14、profile 21 Figure 8a) Label area 22 Figure 8b) Label area 23 Figure 9a) Tape path and drive dimensions 24 Figure 9b) Tape path and drive dimensions 25 Figure 10a) Tape guide and track dimensions 26 Figure 10b) Tape guide and track dimensions 27 Figure 11 Measuring device 29 Figure 12a) Measuring mas
15、k 30 Figure 12b) Measuring mask 30 Figure 13 Test for layer-to-layer adhesion 31 Figure 14 Test rod 32 Table Dimensions of the rod 32ISO4057:1986 (E) BSI 02-2000 iii Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member b
16、odies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental a
17、nd non-governmental, in liaison with ISO, also take part in the work. Draft International Standards adopted by the technical committees are circulated to the member bodies for approval before their acceptance as International Standards by the ISO Council. They are approved in accordance with ISO pro
18、cedures requiring at least75% approval by the member bodies voting. International Standard ISO4057 was prepared by Technical Committee ISO/TC97, Information processing systems. ISO4057 was first published in1979. This second edition cancels and replaces the first edition, of which it constitutes a m
19、inor revision. Users should note that all International Standards undergo revision from time to time and that any reference made herein to any other International Standard implies its latest edition, unless otherwise stated.iv blankISO4057:1986(E) BSI 02-2000 1 1 Scope and field of application This
20、International Standard specifies the characteristics of a6,30mm(0.25in) magnetic tape cartridge intended for data interchange and physical interchangeability between information processing systems utilizing the ISO7-bit coded character set (ISO646), its extensions (ISO2022) and/or the8-bit coded cha
21、racter set (ISO4873). The cartridge is of the twin-hub coplanar type, loaded with a6,30mm(0.25in) magnetic tape for digital recording using the63bpmm 1) (1600bpi 2) ) phase-encoding method. The tape is transported between hubs by an internal belt capstan to the external drive. No tape driving or pos
22、ition sensing elements penetrate the cartridge. The direction of magnetization is in the longitudinal direction of the tape. This International Standard applies to cartridges used for data interchange. Where it applies for testing only, this is specifically stated. NOTENumeric values in the SI and/o
23、r Imperial measurement system in this International Standard may have been rounded 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 original design was made using the Imperial measurement
24、 system. 2 References ISO646, Information processing ISO7-bit coded character set for information interchange. ISO2022, Information processing ISO7-bit and8-bit coded character sets Code extension techniques. ISO4873, Information processing8-bit code for information interchange Structure and rules f
25、or implementation. 3 Definitions For the purpose of this International Standard the following definitions apply. 3.1 magnetic tape a tape which accepts and retains magnetic signals intended for input/output and storage purposes of information processing and associated systems 3.2 reference tape cart
26、ridge a tape cartridge selected for a given property for calibrating purposes 3.3 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 3.4 signal amplitude refer
27、ence 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 established at the US National Bureau of Standards (NBS). Secondary Standard Signal Amplitude Reference Tape cartridg
28、es are available from NBS 3)under Part Number SRM3216. 3.5 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 output at the specified test packing density (see4.3.1) 3.6 test recording curre
29、nt a recording current between145% and155% of the current required to produce the Reference Field 3.7 standard reference amplitude (SRA) the average peak-to-peak signal amplitude derived from the Signal Amplitude Reference Tape Cartridge, at a density of126ftpmm(3200ftpi) using the test recording cu
30、rrent (see3.6). The signal amplitude shall be averaged over4000 flux transitions (see5.3) 3.8 average signal amplitude the average peak-to-peak value of the signal output measured over at least4000 flux transitions 3.9 in-contact an operating condition in which the magnetic surface of a tape is in p
31、hysical contact with a magnetic head 3.10 track a longitudinal area of the tape along which a series of magnetic signals may be recorded 1) Bits per millimetre. 2) Bits per inch. 3) NBS, Office of Standard Reference Materials, Room311, Chemistry Building, Gaithersburg, MD20899, USA.ISO4057:1986 (E)
32、2 BSI 02-2000 3.11 bit density the number of bit flux transitions per unit length of track 3.12 position of flux transitions that position which exhibits the maximum free space flux density normal to the tape surface 3.13 erasing field a unidirectional field of sufficient strength to remove the sign
33、als from the tape 3.14 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 flux transitions to the cartridge positioning plane 3.15 typical field
34、the minimum field which, when applied to the tape under test, causes a signal output equal to95% of the maximum signal output at the specified test packing density 4 Environment and transportation 4.1 Testing environment Tests and measurements made on the cartridge to check the requirements of this
35、International Standard shall be carried out under the following conditions: 4.2 Operating environment Cartridges used for data interchange shall be operated under the following conditions: The temperature shall be measured in the air immediately surrounding the cartridge. Rapid temperature variation
36、s should be avoided. There shall be no deposit of moisture on or in the cartridge. It is recommended that the cartridge should 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 of
37、8h). If a user of a cartridge knows or suspects that it has been exposed to a drop in temperature exceeding17C(30 F) since last used, it is recommended that the tape be rewound one complete cycle on the tape transport before using the cartridge for data interchange. 4.3 Storage environment During st
38、orage it is recommended that recorded cartridges be kept within the following conditions: NOTECartridges which have been exposed to temperatures exceeding the storage temperature range may exhibit degraded performance characteristics. Such cartridges should be subjected to a conditioning period of n
39、ot less than24h within the operating environment prior to use. 4.4 Transportation 4.4.1 Transportation environment During transportation, the cartridge may be exposed to conditions outside the operating environment. It is recommended that the following conditions are not exceeded: 4.4.2 Transportati
40、on 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 final package shall have a clean interior and a construction preventing ingress of
41、 dust or water. It is recommended that sufficient space be provided between cartridge and outer surface of the final container, so that risk of damage due to stray magnetic fields will be negligible. 4.5 Flammability Tape or cartridge components shall be made from materials that, if ignited from a m
42、atch flame, do not continue to burn in a still carbon dioxide atmosphere. 4.6 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. temperature :23 2 C(73 4 F) relative humidity :40% to60% condition
43、ing before testing :24hmin. wet-bulb temperature :18Cmax.(64Fmax.) temperature :5 to45C(41 to113 F) relative humidity :20% to80% wet-bulb temperature :26Cmax.(79Fmax.) temperature :5 to45C(41 to113 F) relative humidity :20% to80% wet-bulb temperature :26Cmax.(79Fmax.) temperature : 40 to45 C (40to11
44、3 F) relative humidity :20% to80% wet-bulb temperature :26Cmax.(79Fmax.)ISO4057:1986(E) BSI 02-2000 3 5 Characteristics of the tape 5.1 Mechanical properties 5.1.1 Tape width The width of the tape shall be 5.1.2 Tape length The length of the tape between the LP and the EW markers (see5.1.4) shall be
45、 for standard length (SL) cartridges and for long length (LL) cartridges. 5.1.3 Tape thickness Approximate tape thickness shall be304m(0.0012in) for the SL cartridge and204m(0.0008in) for the LL cartridge. Absolute limits are controlled through other characteristics of the tape. 5.1.4 Markers In the
46、 tape there shall be a number of markers, the relative positions of which are shown in Figure 1. 5.1.4.1 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 the st
47、orage position for the cartridge. In the storage position, all of the usable recording area shall be wound on the supply hub and shall be protected by at least one layer of tape. The other two markers are used to ensure reliability of detection. The diameter of the BOT holes shall be1,17 0,05mm(0.04
48、6 0.002in). 5.1.4.2 End-of-tape (EOT) An EOT marker shall be a single circular hole punched in the tape. There shall be three such markers along a single line. The first to pass the photo sensor during forward operation indicates that the usable recording area has been exceeded. The other two marker
49、s are used to ensure the reliability of detection. The diameter of the EOT holes shall be1,17 0,05mm(0.046 0.002in). 5.1.4.3 Load-point (LP) The LP marker shall be a single circular hole punched in the tape to indicate the beginning of the usable recording area in the forward direction. The diameter of the LP hole shall be0,58 0,05mm(0.023 0.002in) or1,17 0,05mm(0.046 0.002in). 5.1.4.4 Early-warning (EW) The EW marker shall be a single circular hole punched in the tape for the purpose
