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1、ANSI INCITS 334-2000 (formerly ANSI NCITS 334-2000) for Information Technology Magnetic Tape Cartridge for Information Interchange 0.50 in (12.65 mm), Serial Serpentine 128-Track, 62 500 bpi (2 460 bpmm) DLT 3-XT Format Copyright American National Standards Institute Provided by IHS under license wi
2、th ANSI Licensee=IHS Employees/1111111001, User=listmgr, listmgr Not for Resale, 04/29/2007 20:05:41 MDTNo reproduction or networking permitted without license from IHS -,-,- Copyright American National Standards Institute Provided by IHS under license with ANSI Licensee=IHS Employees/1111111001, Us
3、er=listmgr, listmgr Not for Resale, 04/29/2007 20:05:41 MDTNo reproduction or networking permitted without license from IHS -,-,- ANSI NCITS 334-2000 American National Standard for Information Technology Magnetic Tape Cartridge for Information Interchange 0.50 in (12.65 mm), Serial Serpentine 128-Tr
4、ack, 62 500 bpi (2 460 bpmm) DLT 3-XT Format Secretariat Information Technology Industry Council Approved May 19, 2000 American National Standards Institute, Inc. Copyright American National Standards Institute Provided by IHS under license with ANSI Licensee=IHS Employees/1111111001, User=listmgr,
5、listmgr Not for Resale, 04/29/2007 20:05:41 MDTNo reproduction or networking permitted without license from IHS -,-,- Approval of an American National Standard requires review by ANSI that the requirements for due process, consensus, and other criteria for approval have been met by the standards dev
6、eloper. Consensus is established when, in the judgement of the ANSI Board of Standards Review, substantial agreement has been reached by directly and materially affected interests. Substantial agreement means much more than a simple majority, but not necessarily unanimity. Consensus requires that al
7、l views and objections be considered, and that a concerted effort be made towards their resolution. The use of American National Standards is completely voluntary; their existence does not in any respect preclude anyone, whether he has approved the standards or not, from manufacturing, marketing, pu
8、rchasing, or using products, processes, or procedures not conforming to the standards. The American National Standards Institute does not develop standards and will in no circumstances give an interpretation of any American National Standard. Moreover, no person shall have the right or authority to
9、issue an interpretation of an American National Standard in the name of the American National Standards Institute. Requests for interpretations should be addressed to the secretariat or sponsor whose name appears on the title page of this standard. CAUTION NOTICE: This American National Standard may
10、 be revised or withdrawn at any time. The procedures of the American National Standards Institute require that action be taken periodically to reaffirm, revise, or withdraw this standard. Purchasers of American National Standards may receive current information on all standards by calling or writing
11、 the American National Standards Institute. American National Standard Published by American National Standards Institute, Inc. 11 West 42nd Street, New York, NY 10036 Copyright 2000 by Information Technology Industry Council (ITI) All rights reserved. No part of this publication may be reproduced i
12、n any form, 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 America CAUTION: The developers of this standard have requested that holders of patents that may be re- quired for the implem
13、entation 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, if any, patents may apply to this standard. As of the date of publication of this standard, following calls for the identif
14、ication 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 position is taken with respect to the validity of this claim or of any rights in connection therewith. The known patent holder(s) h
15、as (have), however, filed a statement of willingness to grant a license under these rights on reasonable and nondiscriminatory terms and conditions to applicants desiring to ob- tain such a license. Details may be obtained from the publisher. No further patent search is con- ducted by the developer
16、or publisher in respect to any standard it processes. No representation is made or implied that this is the only license that may be required to avoid infringement in the use of this standard. Copyright American National Standards Institute Provided by IHS under license with ANSI Licensee=IHS Employ
17、ees/1111111001, User=listmgr, listmgr Not for Resale, 04/29/2007 20:05:41 MDTNo reproduction or networking permitted without license from IHS -,-,- i Contents Page 1Introduction 1 1.1Scope. 1 1.2Purpose 1 1.3Conformance . 1 1.3.1Magnetic Tape Cartridges 1 1.3.2Generating systems. 2 1.3.3Receiving sy
18、stems. 2 1.4Dimensions 2 2Normative references. 2 3Definitions 3 3.1Average Signal Amplitude 3 3.2azimuth 3 3.3back surface. 3 3.4Beginning-Of-Tape markers (BOT 1 and BOT 2) 3 3.5byte 3 3.6cartridge. 3 3.7Cyclic Redundancy Check (CRC) character 3 3.8Early Warning (EW). 3 3.9Error-Detecting Code (EDC
19、) 3 3.10End-Of-Tape marker (EOT). 3 3.11Entity 3 3.12Error-Correcting Code (ECC). 3 3.13flux transition position 3 3.14flux transition spacing 3 3.15Logical Block 3 3.16logical track 3 3.17magnetic tape 3 3.18Master Standard Reference Tape 4 3.19object . 4 3.20page. 4 3.21physical block. 4 3.22physi
20、cal recording density 4 3.23physical track. 4 3.24Record . 4 3.25Reference Edge. 4 3.26Reference Field 4 3.27Secondary Standard Reference Tape . 4 3.28Standard Reference Amplitude (SRA). 4 329Standard Reference Current 4 3.30Test Recording Current 4 3.31Typical Field. 4 4Conventions and notations 5
21、4.1Representation of numbers 5 4.2Dimensions 5 4.3Names 5 5Acronyms. 5 Copyright American National Standards Institute Provided by IHS under license with ANSI Licensee=IHS Employees/1111111001, User=listmgr, listmgr Not for Resale, 04/29/2007 20:05:41 MDTNo reproduction or networking permitted witho
22、ut license from IHS -,-,- ii Page 6Environment and safety. 5 6.1Cartridge and tape testing environment. 5 6.2Cartridge operating environment . 6 6.3Cartridge storage environment 6 6.4Safety. 6 6.4.1Safeness 6 6.4.2Flammability. 6 6.5Transportation 6 7Mechanical and electrical requirements 6 7.1Mater
23、ial 6 7.2Tape length 6 7.3Width 6 7.4Total thickness. 6 7.5Discontinuity 6 7.6Longitudinal curvature . 7 7.6.1Requirement 7 7.6.2Procedure 7 7.7Out-of-Plane distortions. 7 7.8Cupping . 7 7.9Roughness of the coating surfaces . 7 7.9.1Roughness of the back coating surface. 7 7.9.2Roughness of the magn
24、etic coating surface 7 7.10Coating adhesion. 7 7.11Layer-to-layer adhesion. 8 7.11.1Requirements 8 7.11.2Procedure 8 7.12Modulus of elasticity 9 7.12.1Requirement 9 7.12.2Procedure 9 7.13Flexural rigidity. 9 7.13.1Requirement 9 7.13.2Procedure 9 7.14Tensile yield force 10 7.14.1Procedure 10 7.15Elec
25、trical resistance. 10 7.15.1Requirement 10 7.15.2Procedure 10 7.16Inhibitor tape 10 7.17Abrasivity . 11 7.17.1Requirement 11 7.17.2Procedure 11 7.18Light transmittance of the tape and the leader 11 7.19Coefficient of dynamic friction 11 7.19.1Requirements 11 7.19.2Procedure for the measurement of th
26、e friction between the magnetic surface and the back surface. 12 7.19.3Procedure for the measurement of the friction between the magnetic surface or the back surface and calcium titanate ceramic . 12 8Magnetic recording characteristics of the unrecorded tape. 12 Copyright American National Standards
27、 Institute Provided by IHS under license with ANSI Licensee=IHS Employees/1111111001, User=listmgr, listmgr Not for Resale, 04/29/2007 20:05:41 MDTNo reproduction or networking permitted without license from IHS -,-,- iii Page 8.1Typical Field.13 8.2Signal amplitude.13 8.3Resolution13 8.4Overwrite13
28、 8.4.1Requirement.13 8.5Peak shift .13 8.5.1Requirement.13 8.5.2Procedure.13 9Tape quality14 9.1Missing pulses14 9.1.1Requirement.14 9.2Missing pulse zone.14 9.2.1Requirement.14 9.3Tape durability14 10Mechanical specifications of the tape cartridge .14 10.1Bottom side and right side15 10.2Back side
29、and left side.16 10.3Tape reel16 10.4Tape leader and markers.17 10.5Front side.18 10.6Operation of the cartridge 19 10.7Tape winding20 10.8Moment of inertia .20 10.9Material 20 11Method of recording.29 11.1Physical recording density .29 11.2Channel bit cell length29 11.2.1Average Channel bit cell le
30、ngth .29 11.2.2Long-term average Channel bit cell length 29 11.2.3Short-term average Channel bit cell length29 11.3Flux transition spacing .29 11.4Read signal amplitude29 11.5Azimuth30 11.6Channel skew.30 12Tape format30 12.1Reference Edge.30 12.2Direction of recording.30 12.3Tape layout 30 12.4Cali
31、bration and Directory Area.30 12.4.1Scratch Area 31 12.4.2Guard Area G1.31 12.4.3Calibration Tracks Area31 12.4.4Guard Area G2.32 12.4.5Directory Area32 12.4.6Guard Area G3.32 12.5Data Area.33 12.5.1Physical tracks.33 12.5.2Width of the physical tracks .33 Copyright American National Standards Insti
32、tute Provided by IHS under license with ANSI Licensee=IHS Employees/1111111001, User=listmgr, listmgr Not for Resale, 04/29/2007 20:05:41 MDTNo reproduction or networking permitted without license from IHS -,-,- iv Page 12.5.3Logical tracks. 33 12.5.4Locations of the physical tracks. 33 12.5.5Layout
33、 of tracks in the Data Area 34 13Data format 35 13.1Data Bytes. 36 13.2Logical Blocks 36 13.3Data Blocks 36 13.4Types of Logical Blocks. 36 13.5Entities. 36 13.6Logical Block format 36 13.6.1Preamble . 37 13.6.2Sync. 37 13.6.3Data Field 37 13.6.4EDC . 39 13.6.5Control Field 1 (CF1) . 39 13.6.6Contro
34、l Field 2 (CF2) . 41 13.6.7CRC. 41 13.6.8Postamble 41 14Use of Logical Blocks 42 14.1Data Blocks 42 14.2Filler Blocks . 42 14.3End of Track Blocks (EOTR) . 42 14.4End of Data Blocks (EOD). 42 14.5ECC Blocks 42 15Format of Entities. 42 16Error handling 43 Tables 1Code conversion 29 2Allocation of phy
35、sical tracks to logical tracks 33 3aLocations of the physical tracks (U.S. customary units). 34 3bLocations of the physical tracks (Metric units) 34 Figures 1Measurement of coating adhesion . 8 2Measurement of layer-to-layer adhesion 9 3Measurement of electrical resistance. 10 4Measurement of abrasi
36、vity . 11 5Measurement of peak shift. 14 6General view 21 7Reference planes . 21 8Bottom side 22 9Right side . 23 Copyright American National Standards Institute Provided by IHS under license with ANSI Licensee=IHS Employees/1111111001, User=listmgr, listmgr Not for Resale, 04/29/2007 20:05:41 MDTNo
37、 reproduction or networking permitted without license from IHS -,-,- v Page 10Back side 23 11Left side 24 12Cross section, non-operating position 24 13Cross section, operating position25 14Leader/tape connection25 15Position of tape splice.25 16Tape leader.26 17Front side27 18Back side, position of
38、the back door.27 19Position of the leader tip.28 20Tape layout.30 21Calibration and Directory Areas31 22Calibration Tracks Area 32 23Layout of the tracks of the Data Area .35 24Block format37 25Content of MAP entries.38 26Content of Control Field 1.39 27Content of Control Field 2.41 Annexes AMeasure
39、ment of light transmittance44 BGeneration of the Data Block CRCs.47 CECC generation48 DGeneration of page CRCs 51 EFormat of MAP entries52 FFormat of Control Field 153 GFormat of Control Field 254 HRecommendations for transportation55 JInhibitor Tape55 KRecommendations on tape durability .57 LHandli
40、ng guidelines 58 Copyright American National Standards Institute Provided by IHS under license with ANSI Licensee=IHS Employees/1111111001, User=listmgr, listmgr Not for Resale, 04/29/2007 20:05:41 MDTNo reproduction or networking permitted without license from IHS -,-,- vi Foreword(This foreword is
41、 not part of American National Standard NCITS 334-2000.) This standard presents the minimum requirements for the organization and location of magnetically encoded data on a 0.5 inch (12.65 mm) wide magnetic tape cartridge to allow parties that comply with these requirements to interchange informatio
42、n reli- ably. The standard applies to 128-track, 62 500 bpi (2 460 bpmm), 2,7 RLL recording mode tape drives that operate in the streaming mode. This format is called DLT 3-XT. The advantage of using the format described in this standard is that it provides 1.5 times the data capacity when compared
43、to ANSI X3.282-1996. The impetus to develop this standard was the requirement for higher capacity tape drives to provide backup for the increasingly greater capacities of the fixed disk drives used with information processing systems. This standard was developed by Technical Committee NCITS B5 on Di
44、gital Magnetic Tape. This group consists of specialists experienced and qualified in the recording of digital information on magnetic tape. In the development of this standard, careful con- sideration was given to current practices, existing equipment and supplies, achieving the broadest possible ac
45、ceptance, and providing a basis for future improvement in the use of the medium. This standard contains eight annexes. Annexes A to G are part of this standard and are normative. Annexes H to L are informative and are not considered part of this standard. Suggestions for improvement of this standard
46、 will be welcome. They should be sent to National Committee for Information Technology Standards (NCITS), ITI, 1250 Eye Street, NW, Suite 200, Washington DC 20005-3922. This standard was processed and approved for submittal to ANSI by NCITS. Com- mittee approval of this standard does not necessarily
47、 imply that all committee mem- bers voted for its approval. At the time it approved this standard, NCITS had the following members: Karen Higginbottom, Chair David Michael, Vice-Chair Monica Vago, Secretary Organization Represented Name of Representative Aonix Alexander Nawrocki Apple Computer, Inc.
48、 David Michael Bull HN Information Systems, Inc. Randall Kilmartin Compaq Computer Corporation . Scott Jameson Hewlett-Packard Company. Karen Higginbottom IBM Corporation . Ronald F. Silletti Institute for Certification of Computer Professionals Kenneth M. Zemrowski Lucent Technologies, Inc . Herbert Bertine Microsoft Corporation. Mark Ryland National Institute of Standards if the first physical block has a page of type Tape Mark, the second physical block shall have a first page of type Filler; if the first physi