SIST EN 21864:1997

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Information technology - Unrecorded 12,7 mm (0,5 in) wide magnetic tape for information interchange - 32 ftpmm (800 ftpi) NRZ1, 126 ftpmm (3200 ftpi) phase encoded and 356 ftpm (9042 ftpi) NRZ1 (ISO/IEC 1864:1992)Informationstechnik - Unbeschriebenes 12,7 mm (0.5 in) breites Magnetband für den Datenaustausch bei 32, 126 und 356 Flui 32, 126 und 356 Flußwechsel/mm (800, 3200 und 9042 Flußwechsel/mm (800, 3 200 und 9042 Flußwechsel/in) (ISO/IEC 1864:1992)Technologie de l'information - Bande magnétique vierge de 12,7 mm (0,5 in) de large pour l'échange d'information - 32 ftpmm (800 ftpi) NRZ1, 126 ftpmm (3200 ftpi) par codage de phase et 356 ftpmm (9042 ftpi) NRZ1 (ISO/IEC 1864:1992)Information technology - Unrecorded 12,7 mm (0,5 in) wide magnetic tape for information interchange - 32 ftpmm (800 ftpi) NRZ1, 126 ftpmm (3200 ftpi) phase encoded and 356 ftpm (9042 ftpi) NRZ1 (ISO/IEC 1864:1992)35.220.22Magnetni trakoviMagnetic tapesICS:Ta slovenski standard je istoveten z:EN 21864:1993SIST EN 21864:1997en01-december-1997SIST EN 21864:1997SLOVENSKI
STANDARD



SIST EN 21864:1997



SIST EN 21864:1997



SIST EN 21864:1997



INTERNATIONAL STANDARD 1864 Fourth edition 1992-06-15 Information technology - Unrecorded 12,7 mm (0,5 in) wide magnetic tape for information interchange - 32 ftpmm (800 ftpi), NRZI, 126 ftpmm (3 200 ftpi) Phase encoded and 356 ftpmm (9 042 ftpi), NRZI Technologie de I’informafion - Bande magnetique vierge de 12,7 mm (0,5 in) de /arge, pour I’khange d’infonnation - 32 ftpmm (800 ftpi), NRZI, 126 ftpmm (3 200 ftpi) par codage de phase et 356 ftpmm (9 042 ftpi), NRZI Reference number ISO/IEC 1864: 1992(E) SIST EN 21864:1997



ISO/IEC 1864:1992(E) Foreword ISO (the International Organization for Standardization) and IEC (the In- ternational Electrotechnical Commission) form the specialized System for worldwide standardization. National bodies that are members of ISO or IEC participate in the development of International Standards through technical committees established by the respective organization to deal with particular fields of technical activity. ISO and IEC technical com- mittees collaborate in fields of mutual interest. Other international or- ganizations, governmental and non-governmental, in liaison with ISO and IEC, also take patt in the work. In the field of information technology, ISO and IEC have established a joint technical committee, ISOAEC JTC 1. Draft International Standards adopted by the joint technical committee are circulated to national bod- ies for voting. Publication as an International Standard requires ap- proval by at least 75 % of the national bodies casting a vote. International Standard ISOAEC 1864 was prepared by Joint Technical Committee ISOAEC JTC 1, Information technology, Sub-Committee SC 11, Flexible magnetic media for digital data Werchange. This fourth edition cancels and replaces the third edition (ISO 1864:1985), of which it constitutes a technical revision. Annexes A and B form an integral part of this International Standard. Annex C is for information only. 0 ISO/IEC 1992 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronie or mechanical, including photocopying and microfilm, without Permission in writing from the publisher. lSO/IEC Copyright Office l Case Postale 56 l CH-1211 Geneve 20 l Switzerland Printed in Switzerland ii SIST EN 21864:1997



~--~ INTERNATIONAL STANDARD ISO/IEC 1864:1992(E) Information technology - Unrecorded 12,7 mm (0,5 in) wide magnetic tape for information interchange - 32 ftpmm (800 ftpi), NRZI, 126 ftpmm (3 200 ftpi) Phase encoded and 356 ftpmm (9 042 ftpi), NRZI 1 Scope This International Standard specifies the character- istics of 12,7 mm (0,5 in) wide magnetic tape with reel, to enable magnetic and mechanical inter- changeability of such tape between information processing Systems. This International Standard applies solely to mag- netic tape for digital recording using the NRZI method of recording at 32 ftpmm and 356 ftpmm (800 ftpi and 9 042 ftpi) or the Phase-encoded method of recording at 126 ftpmm (3 200 ftpi) in which the direction of magnetization is nominally longitudinal. NOTE 1 Some numeric values in the SI and/or Imperial measurement System in this International Standard 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 re- converted. The original design was made using the Im- perial measurement System. ISO 468:1982, Surface roughness - Parameters, their values and general rules for specifying requirements. ISO 1863:1990, Information processing - 94rack, 12,7 mm (0,5 in) wide magnetic tape for information interchange using MRZ 1 at 32 ftpmm (800 ftpi) - 32 cpmm (800 cpi). ISO/IEC 3788: 1990, Information processing - 9-track, 12,7 mm (0,5 in) wide magnetic tape for information interchange using Phase encoding at 126 ftpmm (3 200 ftpi}, 63 cpmm (1 600 cpi). ISO 5652: 1984, Information processing - 9-Track, 12,7 mm (0.5 in) wide magnetic tape for information interchange - Format and recording, using group coding at 246 cpmm (6 250 cpi). ISO 6098: 1984, Information processing - Self-loading cartt-idges for 12,7 mm (0.5 in) wide magnetic tape. ASTM D 2000, Rubber products in automotive appli- cations, classification System for. 2 Normative references 3 Definitions The following Standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publi- cation, the editions indicated were valid. All stan- dards are subject to revision, and Parties to agreements based on this International Standard are encouraged to investigate the possibility of ap- plying the most recent editions of the Standards in- dicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO 209-1: 1989, Wrought aluminium and aluminium alloys - Chemical composition and forms of prod- ucts - Part 1: Chemical composition. For the purposes of this International Standard, the following definitions apply. 3.3 magnetic tape: A tape that will accept and re- tain the magnetic Signals intended for input, output and storage purposes on Computers and associated equipment. 3.2 Master Standard Reference Tape: A tape selec- ted as the Standard for Signal amplitude. NOTE 2 A Master Standard Reference Tape has been established at the US National Institute of Standards and 1 SIST EN 21864:1997



ISO/IEC 1864:1992(E) Technolgy (NIST) for the physical recording densities of 32 ftpmm (800 ftpi) and 126 ftpmm (3 200 ftpi). A further Master Standard Reference Tape has been es- tablished at the NIST for the physical recording density of 356 ftpmm (9 042 ftpi). 3.3 Secondary Standard Reference Tape: A tape for which the magnetic characteristics are known and stated in relation to that of the Master Standard Reference Tape. it is intended that these be used for calibrating tertiary reference tapes for use in routine calibration. See annex B. NOTE 3 Secondary Standard Reference Tapes are available from the NIST, Office of Standards Reference Materials, Room 205, Building 202, National Institute of Standards Technology, Gaithersburg, MD 20899, USA, under the following part numbers: SRM 3200 for 32 ftpmm (800 ftpi) and 126 ftpmm (3 200 ftpi) SRM 6250 for 356 ftpmm (9 042 ftpi) 3,4 Average Signal Amplitude: The average peak- to-peak value of the Signal output to the read head when measured over a minimum of 76 mm (3,0 in) of tape. 3.5 Typical Field: In the plot of the Average Signal Amplitude against the recording field at the speci- fied physical recording density, it is the minimum Geld that Causes an Average Signal Amplitude equal to 95 % of the maximum Average Signal Amplitude. 3.6 Reference Field: The typical field of the Master Standard Reference Tape at the specified physical recording density. 3.7 Standard Reference Current: The current that produces the Reference Field. Traceability to the Standard Reference Current is provided by the calibration factor(s) supplied with each Secondary Standard Reference Tape. 3.8 Test Recording Current: The current that is k times the Standard Reference Current, where k equals: 2,0 to 2,2 at 32 f?pmm (800 ftpi) 1,75 to 1,85 at 126 ftpmm (3 200 ftpi) 1,35 to 1,45 at 356 ftpmm (9 042 ftpi) 3.9 Standard Reference Amplitude; SRA: The Aver- age Signal Amplitude from the Master Standard Reference Tape when it is recorded with the appro- priate Test Recording Current at one of the specified physical recording densities. Traceability to the Standard Reference Amplitude is provided by the calibration factor(s) supplied with each Secondary Standard Reference Tape. 3.10 reference edge: The edge furthest from an observer when the tape is lying flat with the mag- netic surface uppermost and the direction of move- ment for recording is from left to right. 3.11 in-contact: An operating condition in which the magnetic surface of a tape is in contact with a mag- netic head. 3.12 track: A longitudinal area on a tape along which a series of magnetic Signals may be recorded. 3.13 row: Nine transverse ly-related locations (one in ea ch tra ck) in which bits are recorded. 3.14 Position of flux transition: That Point which exhibits the maximum free-space flux density normal to the tape surface. 3.15 physical recording density: The number of re- corded flux transitions per unit length of track (ftpmm or ftpi). 3.16 data density: The number of data characters stored per unit length of tape (cpmm or cpi). 3.17 resistance per Square: The surface resistance of a Square area of any size measured between electrodes placed along two opposite sides of the Square. The unit of measurement is the ohm. 3.18 Oxide coating to brass and chrome: The re- sistance of the tape Oxide coating to motion on brass (chrome). 3.19 Oxide coating to tape back surface: The re- sistance of the tape Oxide coating to motion on the tape back surface. 3.20 tape back surface to stainless steel: The re- sistance of the tape back surface to motion on stainless steel. 3.21 rubber to tape back surface: The resi the ta pe back s urface to motion on rubber. 4 Environment stance of The conditions specified below refer to the ambient conditions in the test or Computer room and not to those within the tape drive equipment. 4.1 Testing environment Unless otherwise stated, all measurements made on a tape to check compliance with the require- ments of this International Standard and all tests 2 SIST EN 21864:1997



ISO/IEC 1864:1992(E) prescribed for a tape in this International Standard shall be carried out under the environmental con- ditions of 23 “C + 2 OC (73 “F + 4 OF) and relative humidity 40 % t&60 %, after G least 24 h of con- ditioning in the Same environment. 4.2 Operating environment The operating temperature shall be within the range 16 “C to 32 “C (60 “F to 90 OF) and the relative hu- midity 20 % to 80 %. Operation near the extremes of these ranges tan result in degraded Performance. The wet bulb temperature shall not exceed 25 OC (78 OF). 4.3 Storage environment During storage, it is recommended that the tapes are kept within the following conditions: 4.3.1 Unrecorded tape temperature: 5 “C to 48 “C (40 “F to 120 OF) relative humidity: 20 % to 80 % wet bulb temperature: not greater than 26 OC (80 OF) 4.3.2 Recorded tape temperature: 5 OC to 32 “C’(40 “F to 90 OF) relative humidity: 20 % to 80 % wet bulb temperature: not greater than 26 “C (80 OF) 5 Characteristics of the tape 5.4 Base material thlckness The base material thickness shall be 0,038 mm (0,001 5 in) nominal. 5.5 Coatlng thickness The coating thickness shall not exceed 0,015 mm (0,000 6 in). 5.6 Length The normal minimum length of tape is 732 m (2 400 ft) splice-free. If the length of the tape is less than 732 m (2 400 ft), the actual length shall be stated. Maximum tape length is limited by thickn’ess, E value (see 5.7), moment of inertia and reel di- mensions. 5.7 E value The E value is the radial distance by which the reel flanges extend beyond the outermost layer of a tape which has been wound at a tension of 2 N to 3,6 N (7 ozf to 13 ozf) on the specified reel. The minimum E value shall be 3,2 mm (0,125 in). When the tape is used with a self-loading cartridge (see ISO 6098), the E value shall satisfy: 6,3 mm (0,25 in) < E < 15,9 mm (0,625 in) 5.8 Elastoplastic properties The elastoplastic properties of the tape shall be such that when the tape is subjected to a tension of 30 N (108 ozf) for a period of 3 min under any com- bination of temperature and relative humidity within the ranges of IO “C to 50 “C (50 OF to 122 OF) and 20 % to 80 % relative humidity, the permanent elongation measured with negligible tension after a second 3 min interval is less than 1,0 %. 5.1 Material 5.9 Longitudinal curvature The tape shall consist of a base material (oriented polyethylene terephthalate film or its equivalent) coated on one side with a strong yet flexible layer of ferromagnetic material dispersed in a suitable binder. If the tape is also coated on the rear surface, the coating shall be non-ferromagnetic. 5.2 Width Th (0 9 e width of the tape shall be 12,7 Ti*: mm 500 -t~O,OOO l I -0,004 In) * 5.3 Total tape thickness The total tape thickness, at any Point, shall be 0,048 mm + 0,008 mm (0,001 9 in + 0,000 3 in). There shall be a minimum radius of curvature for the edge of the tape, defined and tested by allowing a 1 m (36 in) length of the tape to unroll and assume its natura1 curvature on a flat surface. The minimum radius shall be 33 m (108 ft). If measured over an arc of a circle, this corresponds to a deviation of 3,8 mm (1/8 in) from a 1 m (36 in) chord. 5.10 Tape wind Tape shall be wound, with its magnetic surface to- ward the reel hub, in a clockwise direction; i.e. when the reel is viewed from the front, the loose end of the tape hangs from the right side of the reel. Tape shall be wound with a tension of 2 N to 3,6 N (7 ozf to 13 ozf) (see figure2). SIST EN 21864:1997



iSO/iEC 1864:1992(E) 5.11 Magnetit properties 5.16 Test for missing Pulses and extra Pulses The magne here by B- defined by 5.15. tic properties of the tape are not defi ned H loops or similar paramete rs, but are the testing procedu res given in 5.13 and 5.12 Test density For the purpose of testing tape in accordance with this International Standard, the physical recording density shall be 32 ftpmm, 126 ftpmm or 356 ftpmm (800 ftpi, 3 200 ftpi or 9 042 ftpi). The flux transitions shall be uniformly spaced. The flux transition spac- ing and the track configuration shall conform to ISO 1863, ISO 3788 or ISO 5652 as appropriate. 5.13 Typicai Fieid The Typical Field of the tape under test shall be within + 20 - % of the Reference Field for a physical recording density of 32 ftpmm (800 ftpi) or 126 ftpmm (3 200 ftpi) and within + 15 % of the Ref- erence Field for a physical recording density of 356 ftpmm (9 042 ftpi). 5.14 Average Signal Ampiitude When read back on a System, each channel of which has been calibrated relative to the SRA, the Average Signal Amplitude shall be within + IO % of the SRA at 32 ftpmm (800 ftpi), within TfF”h at 126 ftpmm (3 200 ftpi) and within + 40 % at 356 ftpmm _ (9 042 ftpi). This test shall be conducted on the pass for both tapes. read-while-write NOTE 4 lt has been observed that the Average Signal Amplitude level at 356 ftpmm (9 042 ftpi) tan vary along the length of tape. This effect is termed “tilt” and is the subject of an investigation to determine its magnitude. Results indicate that a Variation of 20 % tan be expected. The effect of such variations is included in the specified tolerante on Average Signal Amplitudes. 5.15 Ease of erasure When a tape has been recorded according to any of the conditions specified in 5.13 and then passed through a longitudinal unidirectional steady field of 79 500 A/m (1 000 Oe), the remaining Average Sig- nal Amplitude shall not exceed 4 % of the SRA for that density. The erasu re fiel d shall be rea sona as that in the m iddle of a sole noid. bly uniform, such These tests shall be carried out in the in-contact condition and over the entire tested area, which shall extend from 0,2 m (8 in) before the BOT re- flective marker to 3,0 m (10 ft) beyond the EOT re- flective marker (see figure 1). When performing the tests in 5.16.1 and 5.16.2, the output or resultant Signal shall be measured on the Same relative pass for both the Master Standard Reference Tape and the tape under test, i.e. read- while-write or read-on-first-pass-after-write. The SRA shall be measured at the appropriate density. 516.1 Missing pulses When a tape has been recorded on all tracks as specified in 5.12 and 5.13, and is played back on a System, each channel of which has been calibrated as a) W C) in 5.14, a missing pulse shall be either: at 32 ftpmm (800 ftpi), any Signal from any track having a base-to-peak amplitude less than 50 % of half the SRA; at 126 ftpmm (3 200 ftpi), any pair of consecutive output pulses from any track together having a peak-to-peak amplitude less than 35 % of the SRA; at 356 ftpmm (9 042 ftpi), any Signal from any track having a base-to-peak amplitude less than 35 % of half the SRA; 516.2 Extra pulses Following DC-erasure of the tape on the machine used for conducting the missing pulse test as de- scribed in 5.16.1, any Signal from any track when measured base-to-peak which exceeds IO % of half the SRA shall be an extra pulse. 5.16.3 Allowable number of missing pulses and extra pulses The allowable number of missing pulses and of ex- tra pulses is not specified by this International Standard, but is a matter for agreement between interchange Parties. NOTE 5 lt is considered impractical to specify this number for the following reasons: a) the Performance of test equipment for magnetic tape is not uniform but depends on such things as tape tension, head design, and the method of guidance employed; b) different machines and Systems of programming vary in their ability to tolerate missing and extra pulses on tapes. 4 SIST EN 21864:1997



5.17 Reflective markers ISO/IEC 1864:1992(E) 5.20 Resistance Esch reel sf tape shall be furnished with two photo- reflective markers, each consisting of, or equivalent to, a transparent plastic base with a metallic (for example, vaporized aluminium) coating sandwiched between the base and a thin layer of low cold flow thermal setting adhesive. Reflective markers shall be placed on the side of the tape which does not carry the magnetic surface, and they shall be on opposite edges of the tape with the beginning-of-tape reflective marker (BOT) on the reference edge. The width of the markers shall be 4,8 mm + 0,5 mm - (0,19 in + 0,02 in). The length of the markers shall be 28 mm + 5 mm - (IJ in + 0,2 in). The thickness of the markers, measured after their application to the tape, shall be not greater than 0,020 mm (0,000 8 in). The beginning-of-tape reflective marker (BOT) shall be placed 4,9 m + 0,6 m (16 ft + 2 ft) from the be- ginning of the tapcand the end-of-tape marker (EOT) shall be placed 7,6 ‘fi*o m (25 ‘Tz ft) from the end of the tape and such that the tested area is at least 720,6 m (2 363 ft) in length. The distance from the outer edge of a marker to the adjacent edge of the tape shall be 0,8 mm max. (0,031 in max.) and the marker shall not protrude beyond t
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