BS 4783-8-1994 Storage transportation and maintenance of media for use in data processing and information storage - Recommendations for 4 mm and 8 mm helical scan tape cartridges《数.pdf

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1、BRITISH STANDARD BS 4783-8: 1994 Storage, transportation and maintenance of media for use in data processing and information storage Part 8: Recommendations for 4 mm and8 mm helical scan tape cartridges UDC 681.327.68:651.54BS4783-8:1994 This British Standard, having been prepared under the directio

2、nof the Information Systems Technology StandardsPolicy Committee, waspublishedunder the authorityofthe Standards Boardand comes into effect on 15May1994 BSI 03-2000 The following BSI references relate to the work on this standard: Committee reference IST/4 Draft for comment 93/651243 DC ISBN 0 580 2

3、3017 1 Committees 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: British Computer Society ICI Imageda

4、ta Institute of Quality Assurance Institution of Electrical Engineers International Computers Limited Kodak Limited Amendments issued since publication Amd. No. Date CommentsBS4783-8:1994 BSI 03-2000 i Contents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 Informative refere

5、nces 1 3 Definitions 1 4 Library 1 5 Control procedures for incoming cartridges 2 6 Environment and storage 4 7 Handling 4 8 Cleaning and maintenance 5 9 Identification and correction of faults 5 10 Transportation 6 Annex A (informative) Recommended inspection procedures 7 Figure 1 Example of a tape

6、 cartridge record card 3 Table 1 Environmental conditions immediately surrounding the cartridge 5 List of references Inside back coverBS4783-8:1994 ii BSI 03-2000 Foreword This Part of BS4783has been prepared under the direction of the Information Systems Technology Standards Policy Committee. It ha

7、s been developed from advice and information provided by government computing departments, media suppliers and manufacturers, users and specialist media maintenance organizations. It is written as a guide to users for the purpose of managing their computer media. The use of high-grade materials and

8、modern production techniques, that include rigorous testing and inspection, ensures that4mm and8mm helical scan tape cartridges are manufactured to exacting standards. To continue to benefit from the care taken during manufacture, and to ensure optimum performance from a product during its life, the

9、 user should exercise care, and this British Standard gives appropriate advice. Manufacturers publications often cover some of the advice given herein and, where available, should be read in conjunction with this standard. The following Parts of BS4783have already been published: Part 1: Recommendat

10、ions for disk packs, storage modules and disk cartridges; Part 2: Recommendations for magnetic tape on open spools; Part 3: Recommendations for flexible disk cartridges; Part 4: Recommendations for magnetic tape cartridges and cassettes; Part 5: Recommendations for12.7mm magnetic tape cartridges for

11、 data interchange, recording at1491data bytes per millimetre on18tracks; Part 6: Recommendations for optical disk cartridges (ODC); Part 7: Recommendations for optical data disks (CD-ROM). The following British Standards and International Standards are relevant to4mm and8mm helical scan tape cartrid

12、ges. BS 6266, Code of practice for fire protection for electronic data processing installations. BS 7083, Recommendations for the accommodation and operating environment of computer equipment. The following standards define the magnetic tape cartridges to which this standard applies. BS ISO/IEC 1077

13、7, Information technology 3,81 mm wide magnetic tape cartridge for information interchange Helical scan recording DDS format. BS ISO/IEC 11319, Information technology 8 mm wide magnetic tape cartridge for information interchange Helical scan recording. BS ISO/IEC 11321, Information technology 3,81 m

14、m wide magnetic tape cartridge for information interchange Helical scan recording DATA/DAT format. BS ISO/IEC 11557, Information technology 3,81 mm wide magnetic tape cartridge for information interchange Helical scan recording DDS-DC format using 60 m and 90 m length tapes. BS ISO/IEC 12246, Inform

15、ation technology 8 mm wide magnetic tape cartridge dual azimuth format for information interchange Helical scan recording. BS ISO/IEC 12247, Information technology 3,81 mm wide magnetic tape cartridge for information interchange Helical scan recording DDS format using 60 m and 90 m length tapes. BS

16、ISO/IEC 12248, Information technology 3,81 mm wide magnetic tape cartridge for information interchange Helical scan recording DATA/DAT-DC format using 60 m and 90 m length tapes.BS4783-8:1994 BSI 03-2000 iii A British Standard does not purport to include all the necessary provisions of a contract. U

17、sers 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 front cover, pagesitoiv, pages1to8, an inside back cover and a back

18、 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.iv blankBS4783-8:1994 BSI 03-2000 1 1 Scope This Part of BS4783provides recommendations on the care and maintenance of4mm and8

19、mm helical scan tape cartridges. It includes recommendations for storage, handling, transportation, inspection, maintenance and fault identification. 2 Informative references This Part of BS4783refers to other publications that provide information or guidance. Editions of these publications current

20、at the time of issue of this standard are listed on the inside back cover, but reference should be made to the latest editions. 3 Definitions For the purposes of this Part of BS4783, the following definitions apply. 3.1 base film the substrate material of the tape that supports the coating 3.2 cinch

21、ing tape folds between layers of tape in a tape pack resulting from longitudinal slippage caused by uneven tension when the roll is accelerated or decelerated 3.3 edge damage defects at the edge of the tape 3.4 edge lip a deformation in the edge of the base film 3.5 error a failure to read correctly

22、 a bit of information 3.6 long term storage any storage period greater than6months 3.7 physical beginning of tape (PBOT) the point where the leader tape is joined to the magnetic tape 3.8 physical end of tape (PEOT) the point where the trailer tape is joined to the magnetic tape 3.9 extreme environm

23、ent environmental conditions outside the limits recommended in this Part of BS4783 NOTESee clause6. 3.10 library a storage area for media and associated equipment 3.11 magnetic tape tape that will accept and retain the magnetic signals intended for input, output and storage purposes on computer and

24、associated equipment 3.12 magnetic tape cartridge a container holding tape that can be processed without separating it from the container 3.13 retries a number of re-read attempts determined by the type of system 3.14 tape cleaner a device designed to clean the recording surface of the tape 3.15 tap

25、e evaluator a device that evaluates the physical and magnetic quality of the tape 4 Library 4.1 General Cartridges should be suitably stored and their use should be monitored by means of a central facility. NOTEAlso see the recommendations for environment and storage in clause6. 4.2 Personnel Person

26、nel should be trained in their responsibility for the condition, care and handling of cartridges. Ideally, an individual should be designated as the Librarian with overall responsibility for day-to-day maintenance and control 4.3 Equipment The maintenance equipment available at a computer installati

27、on will inevitably be governed by the library size and comparative cost effectiveness. Site policy should clearly indicate who is responsible for the provision of resources and equipment (such as cartridge evaluators and cleaners), and consumables (cleaning fluids and materials), e.g.the equipment e

28、ngineers or operational staff.BS4783-8:1994 2 BSI 03-2000 4.4 Location The library should be sited away from electrical equipment and dust-producing peripherals such as line printers, paper tape or punched card machines. The library should be adjacent to the computer room, with the same or very simi

29、lar environmental conditions. Monitoring devices for temperature and humidity should be installed. Stationery and cardboard containers should not be stored within the area. Chemicals and other materials stored in the library should be restricted to those required for on-going maintenance. 4.5 Securi

30、ty, safety and cleanliness Access to the storage and operational areas should be controlled and restricted to essential personnel, both to keep down the amount of dust and dirt and to maintain security. Potentially hazardous items (e.g.cleaning fluids) should be identified with a suitable warning la

31、bel and should be kept in a locked cabinet when not in use. Storage and operational areas should not be allowed to become contaminated and preventative cleaning, using a disciplined schedule, should be implemented. A smart, clean working environment is often an outward sign of an effective unit and

32、may positively assist employee morale. There should be no eating, drinking or smoking in this area because of the risk of contamination. The materials, equipment and methods used to clean the storage and operational areas should be approved by the equipment suppliers or media manufacturers. Precauti

33、ons should be taken to eliminate electrostatic effects. All personnel should wear clothing that is anti-static and does not shed fibres. Some personal cosmetics, including hand creams, nail varnish and face powders, may lead to contamination and their use should be avoided. 5 Control procedures for

34、incoming cartridges 5.1 Incoming inspection On receipt of new or interchanged cartridges, the recommended inspection procedures described in Annex A should be followed. Any cartridge delivered in a damaged carton should be set aside for immediate reference to the consignor in case the consignor need

35、s to make a claim against the carrier. The high standards of dust filtration and cleanliness used during manufacture normally ensure that newly delivered cartridges do not require cleaning prior to use. However, a preliminary inspection by the user is essential and, if contamination is suspected, a

36、site engineer or media supplier, or both, should be asked for advice. NOTEAlso see the recommendations for identification and correction of faults in clause9. 5.2 Records When any cartridge is brought into the storage area, a record should be created or updated, as in the example shown inFigure 1. T

37、he record should contain information relating to usage, cleaning, inspection and certification. This information should be used to determine maintenance requirements and end of economic life. 5.3 Acclimatization Acclimatization is needed to allow the effects of temperature and relative humidity to s

38、tabilize. The period required for acclimatization depends on: a) the time that the cartridge has been outside the limits of environmental conditions for the operational limits (seeTable 1); and b) the extremes of temperature and humidity to which the cartridge has been subjected during shipment, alb

39、eit in its transit carton. As a general guide all cartridges should be conditioned for a minimum of6h in the same environment as that in which the cartridge drive is operating. Ideally, however, cartridges should be acclimatized for at least24h before use. If full acclimatization is not allowed, err

40、or conditions may occur that would otherwise not be present had the cartridge been stabilized to the computer room environment. Where extreme environmental conditions exist, with temperatures and/or humidity outside those recommended for storage (seeTable 1), cartridges should be subjected to at lea

41、st24h acclimatization in the recommended storage environment before removal from the transit carton. Failure to do this may result in condensation forming on the tape surfaces with associated risk to performance.BS 4783-8:1994 BSI 03-2000 3 Tape cartridge record card Rack location. Cartridge no. . M

42、anufacturers serial nos. . Length Date File name Cartridge no. Generation no. Retention period Created Release data Clean/test date Failure type (if any) Comments (see note) Unit no. Date NOTEUse “Comments” space to record additional information. In the event of failure, unit no. and location of fai

43、l may be helpful. Abnormal repeat rates should also be noted Figure 1 Example of a tape cartridge record cardBS4783-8:1994 4 BSI 03-2000 5.4 Labelling Labels and marking systems should be those recommended by the cartridge supplier. For example, graphite pencils or felt-tipped pens with water-solubl

44、e ink should not be used. Labels should be securely affixed within the approved areas as defined by the media supplier. The whole area of the label should be in contact with the cartridge housing. Where a semi-permanent label is required, the adhesive should be of such a type that, when the label is

45、 removed, negligible residue remains. Information should not be erased from labels while they are attached to cartridges. If information is to be changed, old labels should be removed before applying new labels. 5.5 Equalization of tape tension After acclimatization and before use, all cartridges sh

46、ould be subjected to a full length forward and rewind cycle to stabilize the tension within the wind and to relieve any stress remaining. 6 Environment and storage 6.1 Environment Monitoring devices for temperature and humidity should be installed and should operate continuously. Cartridges should n

47、ot be kept in an environment where rapid changes of temperature and/or humidity may occur, e.g. near humidifier/de-humidifier units. Storage and operational areas should be dust-free and away from dust-producing peripherals such as line printers. Exposure to direct sunlight, or to intense magnetic f

48、ields from large electrical devices, magnets and lightning conductors, may cause permanent damage to cartridges, or recorded data, or both and should be avoided. The ambient stray magnetic-field intensity should not exceed4000A/m. The storage area should have environmental conditions the same as, or

49、 very similar to, those of the operational area. Environmental conditions should be either those recommended by the cartridge manufacturers or as given inTable 1. 6.2 Protection When not in use, cartridges should be suitably stored in their containers. The container should be closed after replacing the cartridge. For extra security, cartridges should be stored within metal, fire-resistant cabinets with lockable doors. 6.3 Long term storage If long term storage of data is required the cartridge used should be of good