ANSI INCITS 312-1998 Information Technology - Magnetic Tape Cartridge for Information Interchange 0.50 in (12.65 mm) Serial Serpentine 128-Track 81 600 bpi (3212 bpmm) DTL4 Format.pdf
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1、ANSI INCITS 312-1998 (R2003)(formerly ANSI NCITS 312-1998)for Information Technology Magnetic Tape Cartridgefor Information Interchange,0.50 in (12.65 mm),Serial Serpentine, 128-Track,81 600 bpi (3212 bpmm) DLT4 FormatANSINCITS 312-1998American National Standardfor Information Technology Magnetic Ta
2、pe Cartridgefor Information Interchange,0.50 in (12.65 mm),Serial Serpentine, 128-Track,81 600 bpi (3212 bpmm) DLT4 FormatSecretariatInformation Technology Industry CouncilApproved April 28, 1998American National Standards Institute, Inc.Approval of an American National Standard requires review by A
3、NSI 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 affected interests. Subs
4、tantial 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; theirexistence does not i
5、n 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 circumstances give inte
6、rpretation on 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 secretariat or sponsor whose n
7、ame 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 standard. Purchasers of Ameri
8、can 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 Information Technology Indus
9、try 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 the publisher.Printed in the United States of AmericaCAUTION:The developers of this standard have requested that holders o
10、f 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 may apply to this standard.As of the date of publication of thi
11、s standard, following calls for the identification of patents thatmay be required for the implementation of the standard, notice of one or more such claims hasbeen received.By publication of this standard, no position is taken with respect to the validity of this claim or ofany rights in connection
12、therewith. The known patent holder(s) has (have), however, filed a state-ment of willingness to grant a license under these rights on reasonable and nondiscriminatoryterms and conditions to applicants desiring to obtain such a license. Details may be obtained fromthe publisher.No further patent sear
13、ch is conducted by the developer or publisher in respect to any standard itprocesses. No representation is made or implied that this is the only license that may be requiredto avoid infringement in the use of this standard.iContentsPageForeword.iv1Introduction. 11.1 Scope . 11.2 Purpose 11.3 Conform
14、ance 21.4 Dimensions. 22Normative references . 23Definitions. 34Environment and safety 54.1 Cartridge and tape testing environment . 54.2 Cartridge operating environment 64.3 Cartridge storage environment. 64.4 Transportation 64.5 Safety . 65Tape mechanical, electrical, and magnetic requirements 75.
15、1 Material. 75.2 Tape Length . 75.3 Total thickness 75.4 Width 75.5 Discontinuity . 75.6 Longitudinal curvature 75.7 Out-of-plane distortions 75.8 Cupping 85.9 Coating surface roughness. 85.10 Coating adhesion 85.11 Layer-to-layer adhesion 95.12 Youngs modulus 105.13 Flexural rigidity . 105.14 Tensi
16、le yield force. 105.15 Electrical resistance of the recording surface. 115.16 Electrical resistance of the back surface 115.17 Inhibitor tape. 125.18 Abrasivity 125.19 Tape and leader opacity. 135.20 Friction coefficient. 135.21 Pre-record condition . 136Tape magnetic recording performance. 146.1 Ty
17、pical field. 146.2 Signal amplitude. 146.3 Resolution. 146.4 Overwrite 146.5 Peak shift 156.6 Self-erasure 157Tape quality 16iiPage7.1 Dropouts. 167.2 Excessive duration error. 167.3 Tape edge quality. 168Mechanical specifications of the tape cartridge 168.1 Cartridge case label areas . 178.2 Cartri
18、dge positioning planes. 178.3 Tape cartridge case material 178.4 File-protect mechanism 178.5 Reel lock mechanism . 188.6 Tape winding 188.7 Winding tension 188.8 Tape-reel diameter . 188.9 Tape-reel moment of inertia . 188.10 Leader attachment . 188.11 Cartridge leader position 188.12 Leader retrac
19、t velocity 188.13 Tape exit angles . 198.14 Tape access door. 198.15 Tape position holes 199Recording . 199.1 Method of recording . 199.2 Code conversion 199.3 Physical recording density 199.4 Bit-cell length 199.5 Read signal amplitude 209.6 Azimuth 209.7 Channel skew. 2010Tape format 2010.1 Refere
20、nce edge of tape 2010.2 Direction of recording . 2010.3 Tape layout. 2010.4 Calibration/directory area . 2110.5 Data area 2311Format of data 2511.1 General. 2511.2 Data bytes 2511.3 Logical blocks. 2512Format and content of block structures 2712.1 Preamble 2712.2 Sync . 2712.3 Data field 2712.4 EDC
21、2812.5 Control field 1 . 2812.6 Control field 2 . 3012.7 Cyclical redundancy check (CRC) 3112.8 Postamble 3112.9 Use of logical blocks. 31iiiPage13Entity. 3314Error handling . 33Tables1RLL code conversion 332Dimensions (customary and SI) for figures. 343Identification of tracks . 394Block format 435
22、Contents of Map Entries . 446Control field 1 configuration 457Control field 2 configuration 46Figures1Tape resistance measurement electrodes 472Tape resistance measurement circuit. 473Waveform of peakshift 484Measurement of abrasivity 495Drawing coordinate system 506Tape cartridge. 507Cartridge - Bo
23、ttom view 518Reel locks and notches 529Cartridge - Operating position. 5310Cartridge - Side view 5411Cartridge - Cross section 5512Cartridge reel assembly 5613Cartridge leader 5714Position of cartridge leader . 5815Tape/leader exit angles 5916Format of calibration area. 6017Calibration track positio
24、n 6118Format of data area 6219ECC blocks . 6320Entity format 65AnnexesAPre-record condition and magnetic moment measurement 66BRecommendations for transportation 67CTape cartridge handling guidelines. 69ivPageDRecommendations on tape durability . 70EBibliography 71vForeword (This foreword is not par
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