1、ANSI INCITS 315-1998 (R2003) (formerly ANSI NCITS 315-1998)for Information Technology Magnetic Tape and Cartridgefor Information Interchange Unrecorded, 128-track, Parallel Serpentine,12.65 mm (1/2 in), 2550 ftpmm (64 770 ftpi)ANSINCITS 315-1998American National Standardfor Information Technology Ma
2、gnetic Tape and Cartridgefor Information Interchange Unrecorded, 128-track, Parallel Serpentine,12.65 mm (1/2 in), 2550 ftpmm (64 770 ftpi)SecretariatInformation Technology Industry Council (ITI) Approved July 27, 1998American National Standards Institute, Inc.Approval of an American National Standa
3、rd requires review by ANSI that therequirements for due process, consensus, and other criteria for approval havebeen met by the standards developer.Consensus is established when, in the judgement of the ANSI Board ofStandards Review, substantial agreement has been reached by directly andmaterially a
4、ffected interests. Substantial agreement means much more thana simple majority, but not necessarily unanimity. Consensus requires that allviews and objections be considered, and that a concerted effort be madetowards their resolution.The use of American National Standards is completely voluntary; th
5、eirexistence does not in any respect preclude anyone, whether he has approvedthe standards or not, from manufacturing, marketing, purchasing, or usingproducts, processes, or procedures not conforming to the standards.The American National Standards Institute does not develop standards andwill in no
6、circumstances give an interpretation of any American NationalStandard. Moreover, no person shall have the right or authority to issue aninterpretation of an American National Standard in the name of the AmericanNational Standards Institute. Requests for interpretations should beaddressed to the secr
7、etariat or sponsor whose name appears on the titlepage of this standard.CAUTION NOTICE: This American National Standard may be revised orwithdrawn at any time. The procedures of the American National StandardsInstitute require that action be taken periodically to reaffirm, revise, orwithdraw this st
8、andard. Purchasers of American National Standards mayreceive current information on all standards by calling or writing the AmericanNational Standards Institute.American National StandardPublished byAmerican National Standards Institute, Inc.11 West 42nd Street, New York, NY 10036Copyright 1998 by I
9、nformation Technology Industry Council (ITI)All rights reserved.No part of this publication may be reproduced in anyform, in an electronic retrieval system or otherwise,without prior written permission of ITI, 1250 Eye Street NW, Washington, DC 20005. Printed in the United States of AmericaCAUTION:
10、The developers of this standard have requested that holders of patents that may be re-quired for the implementation of the standard disclose such patents to the publisher. However, nei-ther the developers nor the publisher have undertaken a patent search in order to identify which, ifany, patents ma
11、y apply to this standard. As of the date of publication of this standard, followingcalls for the identification of patents that may be required for the implementation of the standard,notice of one or more such claims has been received. By publication of this standard, no positionis taken with respec
12、t to the validity of this claim or of any rights in connection therewith. The knownpatent holder(s) has (have), however, filed a statement of willingness to grant a license underthese rights on reasonable and nondiscriminatory terms and conditions to applicants desiring to ob-tain such a license. De
13、tails may be obtained from the publisher. No further patent search is con-ducted by the developer or publisher in respect to any standard it processes. No representation ismade or implied that this is the only license that may be required to avoid infringement in the use ofthis standard.iContentsPag
14、eForeword v1 Scope, purpose, and application 11.1 Scope . 11.2 Purpose 11.3 Application 11.3.1 Conformance 11.3.2 Dimensions 22 Normative references. 23 Definitions 23.1 anhysteretic erase 23.2 average signal amplitude . 23.3 azimuth. 23.4 back surface. 23.5 bit . 23.6 bit-cell. 23.7 broad-band sign
15、al-to-noise ratio 23.8 byte 23.9 cartridge . 33.10 coincident dropouts 33.11 dropout . 33.12 flux-transition position 33.13 flux-transition spacing 33.14 magnetic tape. 33.15 master standard reference tape . 33.16 physical recording density 33.17 pre-record condition . 33.18 reference field 33.19 re
16、sistance per square. 33.20 resolution 33.21 secondary standard reference tape . 33.22 servo bit-cell . 33.23 servo beginning of tape (Servo BOT). 33.24 servo end of tape (Servo EOT) 33.25 servo track 33.26 standard measurement current (Im). 33.27 standard reference amplitude 33.28 standard reference
17、 current (Ir)43.29 track . 43.30 typical field . 43.31 zero crossing 44 Environment and safety . 44.1 Testing environment of tape and cartridge. 44.2 Operating environment of cartridge 44.3 Storage environment of cartridge. 44.4 Transportation 54.5 Safety . 54.5.1 Safeness 5iiPage4.5.2 Flammability
18、. 55 Mechanical and electrical requirements of tape. 55.1 Material 55.2 Length of tape 55.3 Width 55.4 Total thickness . 55.5 Base-material thickness . 55.6 Discontinuity. 55.7 Longitudinal curvature 55.7.1 Requirement. 55.7.2 Procedure. 55.8 Out-of-plane distortions 55.9 Cupping 65.9.1 Requirement.
19、 65.9.2 Procedure. 65.10 Frictional drag between the recording surface and back surface. 65.10.1 Requirement. 65.10.2 Procedure. 65.11 Coating adhesion . 75.11.1 Requirement. 75.11.2 Procedure. 75.12 Electrical resistance of the coated surface. 75.12.1 Requirement. 75.12.2 Procedure. 75.13 Inhibitor
20、 tape 75.14 Abrasivity 85.14.1 Requirement. 85.14.2 Procedure. 85.15 Friction characteristics after stress. 85.15.1 Requirement. 85.15.2 Procedure. 85.16 Surface roughness . 95.16.1 Requirement. 95.16.2 Procedure. 96 Tape magnetic requirements . 96.1 Magnetic coercivity. 96.1.1 Requirement. 96.1.2 P
21、rocedure. 96.2 Magnetic particle orientation 96.2.1 Requirement. 106.2.2 Procedure. 107 Magnetic recording performance of tape . 107.1 Typical field 107.2 Signal amplitude. 107.3 Resolution 107.4 Broad-band signal-to-noise ratio (BBSNR) 107.4.1 Requirement. 107.4.2 Procedure. 11iiiPage8 Quality of t
22、ape 118.1 Dropout. 118.2 Coincident dropout . 118.3 Dropout density 128.3.1 Requirement. 128.3.2 Procedure. 128.4 Durability of tape. 129 Mechanical specifications of the tape cartridge 129.1 Label areas of cartridge case . 129.2 Locating areas of cartridge case 139.3 Flexibility of cartridge case .
23、 139.3.1 Requirement. 139.3.2 Procedure. 139.4 File-protect mechanism 139.5 Tape-reel hub . 139.6 Metallic insert 149.7 Brake mechanism. 149.7.1 Brake-button material . 149.7.2 In-hand position 149.7.3 In-machine position 149.8 Winding of tape. 149.9 Winding tension 149.10 Circumference of tape reel
24、 . 149.11 Moment of inertia of tape reel. 149.11.1 Requirement. 149.11.2 Procedure. 149.12 Leader block tape attachment 159.13 Leader block pickup position 159.14 Leader block insertion force . 159.14.1 Requirement. 159.14.2 Procedure. 159.15 Leader block pull-out force and work 159.15.1 Requirement
25、. 159.15.2 Procedure. 159.16 Cartridge identification notches 169.17 Inhibitor cartridge 1610 Format of tracks 1610.1 Number of tracks 1610.2 Reference edge of tape 1610.3 Positions of tracks 1611 Servo tracks 1611.1 Servo track locations 1611.2 Servo track physical width 1711.3 Servo track format 1
26、711.4 Servo requirements 1711.4.1 Servo amplitude 1711.4.2 Azimuth. 1711.4.3 Tracking error warning 17ivPage11.4.4 Tracking rate error 1711.4.5 Fade amplitude limit. 1711.4.6 Multiple-channel servo errors. 1711.4.7 Servo edge spacing . 1811.5 Servo verification process 18Tables1 Key to figures 6 to
27、15 . 192 Angle dimensions for figures 6 to 15 223 Data track centerline locations. 23Figures1 Tape resistance measurement electrodes . 242 Tape resistance measurement circuit 243 Ferrite wear bar 254 Wear bar holding fixture. 265 Typical wear bar wear pattern 266 Top and ends of tape cartridge 277 B
28、ottom and side of tape cartridge 288 Description of J character label with bar code . 299 Description of J character label 3010 Bottom side of cartridge showing data cartridge slots 3111 Gear tooth profile . 3212 Hub bottom view 3213 Cross section view of cartridge in hand . 3314 Cross section view
29、of cartridge in machine 3315 Leader block seated in cartridge 3416 Leader block tape attachment 3417 Leader block. 3518 Cross section of leader block opening . 3619 Tape cartridge assembly 3720 Usable recording area 3821 Servo track physical layout 3922 Write current profile for outboard servo track
30、s . 4023 Write current profile for inboard servo tracks . 40AnnexesA Recommendations for transportation. 41B Tape durability 42C Bibliography . 43vForeword (This foreword is not part of American National Standard NCITS 315-1998.)This standard presents physical and magnetic requirements for 12.65-mm
31、(0.498-inch), 128-track magnetic tape cartridge to be used for information interchangeamong processing systems, communication systems, and associated equipment.The NCITS B5 Subcommittee on Digital Magnetic Tape, which developed this stan-dard, consists of experienced and qualified specialists on man
32、ufacturing magnetictape, and on recording digital information on magnetic tape. This standard supportsthe recording density of 2550 ftpmm (64 770 ftpi) and complements American Nation-al Standard for Information systems - Magnetic tape and cartridge for information in-terchange - 18-track, parallel,
33、 1/2 inch (12.65 mm), 37 871 cpi (1491 cpmm), Group-coded - Requirements for recording, ANSI X3.180-1990 (R1996), and InternationalStandard for Information processing - Data interchange on 12.7 mm (0.5 in) widemagnetic tape cartridges - 18 tracks, 1491 data bytes per millimetre (37 871 databytes per
34、 inch), ISO 9661:1988, and American National Standard for Informationtechnology Magnetic tape and cartridge for information interchange - Unrecorded,36-track, parallel, 12.57 mm (0.495 inch), 1944 ftpmm, (49 378 ftpi), Group-coded re-cording, ANSI X3.265-1995. The cartridge, magnetic tape, and recor
35、ding format rep-resent a significant advancement in reliability and volumetric efficiency for half-inchmagnetic tape. In the development of this standard, careful consideration was givento current practices, existing equipment and supplies, the broadest possible accep-tance, and to providing a basis
36、 for future improvements in the use of the cartridgemedium.The standard contains specifications for the physical, magnetic, and performanceproperties of the magnetic media, and the dimensions and characteristics of the car-tridge.This standard includes a number of new criteria that are the result of
37、 experiences ob-tained in high-density recording on magnetic tape. As additional experience isgained, improvement in test methods and the need for additional criteria should beexpected. This is particularly relevant in the areas of mechanical interaction betweenthe magnetic tape and the recording he
38、ad.There are three annexes to this standard. All three are informative and not consid-ered part of this standard.Requests for interpretation, suggestions for improvement or addenda, or defect re-ports are welcome. They should be sent to the NCITS Secretariat, Information Tech-nology Industry Council
39、, 1250 Eye Street, NW, Suite 200, Washington, DC 20005.This standard was processed and approved for submittal to ANSI by AccreditedStandards Committee on Information Technology, NCITS. Committee approval ofthe standard does not necessarily imply that all members voted for its approval. Atthe time it
40、 approved this standard, the NCITS Committee had the following members:Karen Higginbottom, Chair(vacant), Vice-ChairMonica Vago, SecretaryOrganization Represented Name of RepresentativeAMP, Inc. John HillCharles Brill (Alt.)Apple Computer, Inc. David K. MichaelJerry Kellenbenz (Alt.)AT a magnetic ta
41、pe of 12.65 mm (0.498 in) width held inside the case on a reel. The tape shall beservo-written and transported on the reel for recording at a physical density of 2550 ftpmm (64 770ftpi). Signal conditioning techniques may result in a higher effective recording density.1.2 PurposeThe purpose of this
42、standard is to define the requirements and supporting test methods necessary to en-sure information interchange at acceptable performance levels. It is distinct from a specification in that itdelineates a minimum of restrictions consistent with compatibility in interchange transactions.The performan
43、ce levels contained in this standard represent the minimum acceptable levels of perform-ance for interchange purposes. They, therefore, represent the performance levels that the interchangeitems should meet or surpass during their useful life and thus define end-of-life criteria for interchangepurpo
44、ses. The performance levels in this standard are not intended to be employed as substitutes for pur-chase specifications.Wherever feasible, quantitative performance levels that shall be met or exceeded to comply with this stan-dard are given. In all cases, including those in which quantitative limit
45、s for requirements falling within thescope of this standard are not stated but left to agreement between the interchange parties, standard testmethods and measurement procedures shall be used to determine such limits.The interchange parties complying with the applicable standards should be able to a
46、chieve compatibilitywithout the need for additional exchange of technical information.1.3 Application1.3.1 ConformanceA magnetic tape cartridge conforms to this standard if it satisfies all requirements of this standard. Thetape requirements shall be satisfied throughout the extent of the tape.ANSI
47、NCITS 315-199821.3.2 DimensionsThe original dimensions and quantities for all numeric values in this standard are in the International Sys-tem of Units (SI). Conversions of these units to US Customary engineering units (similar to British Imperialunits) and centimeter-gram-second electromagnetic uni
48、ts (cgs-emu) have been incorporated in accor-dance with the procedures described in American National Standard for metric practice, ANSI/IEEE 268-1992. Units of either of the two measurement systems may be referred to, but the two systems should notbe intermixed or reconverted. Conversions of tolera
49、nced dimensions and quantities in this standard havebeen performed in accordance with Method A of ANSI/IEEE 268 and International standard for toleranceddimensions Conversions from inches into millimetres and vice versa , ISO 370:1975, to maintain the im-plied correspondence between the accuracy of the original data and the number of significant digits androunding of the converted values. In the national standards of ISO member bodies, additional roundingmay be done to produce “preferred” values. These values should lie within or close to the original toler-ances.2 Normative refer
