1、ANSI INCITS 328-2000(formerly ANSI NCITS 328-2000)for Information Technology 19 mm DD-2 Helical Scan DigitalComputer Tape Cassettefor Information InterchangeCopyright American National Standards Institute Provided by IHS under license with ANSI Not for ResaleNo reproduction or networking permitted w
2、ithout license from IHS-,-,-Copyright American National Standards Institute Provided by IHS under license with ANSI Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-ANSINCITS 328-2000American National Standardfor Information Technology 19 mm DD-2 Helical Scan Digita
3、lComputer Tape Cassettefor Information InterchangeSecretariatInformation Technology Industry CouncilApproved September 7, 2000 American National Standards Institute, Inc.Copyright American National Standards Institute Provided by IHS under license with ANSI Not for ResaleNo reproduction or networkin
4、g permitted without license from IHS-,-,-Approval of an American National Standard requires review by ANSI that therequirements for due process, consensus, and other criteria for approvalhave been met by the standards developer.Consensus is established when, in the judgement of the ANSI Board ofStan
5、dards Review, substantial agreement has been reached by directly andmaterially affected 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 the
6、ir resolution.The use of American National Standards is completely voluntary; theirexistence 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
7、 American National Standards Institute does not develop standards andwill in no 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
8、Standards Institute. Requests for interpretations should beaddressed to the secretariat 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 re
9、quire that action be taken periodically to reaffirm, revise, orwithdraw this standard. Purchasers of American National Standards mayreceive current information on all standards by calling or writing the AmericanNational Standards Institute.American National StandardPublished byAmerican National Stan
10、dards Institute, Inc.11 West 42nd Street, New York, NY 10036Copyright 2000 by Information 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 St
11、reet NW, Washington, DC 20005. Printed in the United States of AmericaCAUTION:The developers of this standard have requested that holders of patents that may berequired for the implementation of the standard disclose such patents to the publisher. However,neither the developers nor the publisher hav
12、e undertaken a patent search in order to identifywhich, if any, patents may apply to this standard. As of the date of publication of this standardand following calls for the identification of patents that may be required for the implementation ofthe standard, no such claims have been made. No furthe
13、r patent search is conducted by the de-veloper or publisher in respect to any standard it processes. No representation is made or impliedthat licenses are not required to avoid infringement in the use of this standard.Copyright American National Standards Institute Provided by IHS under license with
14、 ANSI Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-iContentsPageForeword.ix1Introduction 11.1 Scope, purpose and application 11.2 Purpose 21.3 Application . 21.3.1 Conformance . 21.3.2 Dimensions 22References. 32.1 American National Standards 32.2 Other standard
15、s . 33Definitions 44Acronyms. 95Environment and safety . 125.1 Testing environment 125.2 Operating environment 125.3 Storage environment 125.4 Safety. 125.4.1 Safeness 125.4.2 Flammability. 125.4.3 Toxicity. 135.5 Test methods . 136Tape characteristics. 136.1 Materials 136.2 Tape width and tolerance
16、 136.2.1 Requirement 136.2.2 Procedure 136.3 Width fluctuation 136.3.1 Requirement 136.3.2 Procedure 136.4 Reference edge straightness. 136.4.1 Requirement 136.4.2 Procedure 136.5 Total tape thickness. 146.6 Discontinuity. 146.7 Longitudinal curvature . 146.7.1 Requirement 146.7.2 Procedure 146.8 Le
17、aders, trailers and splices 146.8.1 Length 146.8.2 Width 146.8.3 Thickness. 146.8.4 Material 146.8.5 Hub attachment 156.8.6 Splices . 156.9 Layer-to-layer adhesion . 15Copyright American National Standards Institute Provided by IHS under license with ANSI Not for ResaleNo reproduction or networking
18、permitted without license from IHS-,-,-iiPage6.9.1 Requirement 156.9.2 Procedure 156.10 Coating adhesion. 166.10.1 Requirement 166.10.2 Procedure 166.11 Offset yield strength. 166.11.1 Requirement 166.11.2 Procedure 166.12 Tensile yield force 166.12.1 Requirement 176.12.2 Procedure 176.13 Residual e
19、longation . 176.13.1 Requirement 176.13.2 Procedure 176.14 Tape cupping . 176.14.1 Requirement 176.14.2 Procedure 176.15 Transmissivity 186.16 Inhibitor tape 187Magnetic and electrical properties . 197.1 Magnetic coating 197.2 Average signal amplitude 197.3 Signal dropout 197.4 Particle orientation
20、. 197.5 Coercivity . 197.6 Electrical resistance. 197.6.1 Requirement 197.6.2 Procedure 198Cassette characteristics. 208.1 General description 208.2 Cassette dimensions . 208.3 Identification and length of cassettes. 208.4 Face of magnetic coating. 208.5 Datum planes. 218.5.1 Datum plane Z . 218.5.2
21、 Datum plane X . 218.5.3 Datum plane Y . 218.6 Windows and labels. 218.7 Identification holes . 218.7.1 Logical sense. 218.7.2 Manufacturers hole set . 218.7.3 User hole set 228.7.4 User plug mechanism 228.8 Reels 228.8.1 Dimensions 228.8.2 Reel locks and springs. 238.8.3 Lid 239Track geometry 509.1
22、 Dimensions and tolerances . 50Copyright American National Standards Institute Provided by IHS under license with ANSI Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-iiiPage9.2 Head gap azimuth 519.3 Helical track curvature 519.4 Longitudinal tracks . 5310Overview
23、 of format constructs 5310.1 Partition 5310.2 System zone 5410.3 End-of-recording considerations 5510.4 Addressing scheme 5510.5 Formatting a cassette. 5510.6 Volume and partition initialization. 5510.7 Read verify and rewrite 5710.8 Append write only. 5711Recorded format 5712Longitudinal track form
24、at 5812.1 Recording method 5912.2 Longitudinal sync word. 5912.3 Servo track (SVT). 6012.4 Physical address track segment (PATS) and longitudinal address track segment (LATS) formats . 6212.4.1 Front padding. 6212.4.2 Rear padding 6212.4.3 Segment formats 6212.5 Physical address track segment (PATS)
25、 definitions 6312.5.1 Format identifier (FID) 6312.5.2 Absolute double-frame number (ADFN). 6412.5.3 Volume identifier (VLID). 6412.5.4 System zone size (SZSZ) 6412.5.5 System zone spacing (SZSP) 6412.5.6 Cyclic redundancy check byte (CRC) 6412.5.7 Odd parity byte (OPB) 6512.6 Logical address track
26、. 6512.7 LATS data field definitions . 6712.7.1 Zone type (ZNTY) 6712.7.2 File section number (FSN) . 6812.7.3 First data block or byte number (FDBN) 6812.7.4 Cumulative data block or byte number (CDBN). 6812.7.5 Partition layout option (PTLO) 6812.7.6 Last valid partition identifier (LVPT) . 6812.7
27、.7 Last valid system zone (LVSZ) 6812.7.8 Last double-frame number (LDFN) 6912.7.9 Partition group A size (PGAS) 6912.7.10 Partition group A count (PGAC). 6912.7.11 Partition group B size (PGBS) 6912.7.12 Partition group B count (PGBC). 6912.7.13 Cyclic redundancy check (CRC) 6912.7.14 Odd parity by
28、te (OPB) 6913Helical format . 7013.1 Helical track content. 70Copyright American National Standards Institute Provided by IHS under license with ANSI Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-ivPage13.1.1 Preamble section . 7013.1.2 Track sync section . 7013.
29、1.2.1 Clock field 1 . 7013.1.2.2 Clock field 2 . 7013.1.2.3 Track sync field 7113.1.3 Postamble 7113.1.4 Data section. 7113.1.4.1 Physical-block residue . 7113.1.4.2 C3 error coding 7213.1.4.3 Inter-track shuffle . 7313.1.4.4 Logical format data insertion 7313.1.4.5 C2 error coding 7313.1.4.6 Intra-
30、track interleave 7413.1.4.7 Identifier insertion 7413.1.4.8 C1 error correction field . 7413.1.4.9 Block sync field 7513.2 Helical channel 7513.3 Serialization . 7513.3.1 Channel coding 7514Logical format data fields. 7614.1 Format identifier (FID) 7814.2 Zone type (ZNTY) 7814.3 Partition identifier
31、 (PTID) . 7814.4 System zone identifier (SZID) 7814.5 File section number (FSN). 7914.6 First data block or byte number (FDBN) 7914.7 Data block or byte (DBB) . 7914.8 Data block checksum enable (DCSE) . 7914.9 End-of-media warning flag (EMWF) 7914.10 Data block size (DBS) 7914.11 Total byte count (
32、TBC). 8014.12 Physical-block sequence tag (PBST) 8014.13 Rewrite enable (RWEN) 8014.14 Remaining rewrite count (RRWC) . 8014.15 Cumulative data block or byte number (CDBN). 8014.16 Absolute double-frame number (ADFN) 8014.17 Helical track type (HTTY). 8014.18 Helical track number (HTKN). 8114.19 Sub
33、 block CRC inverted (SABCI) 8114.20 Partition layout option (PTLO) . 8114.21 System zone size (SZSZ) 8114.22 System zone spacing (SZSP) 8114.23 Partition group A size (PGAS) . 8114.24 Partition group A count (PGAC). 8214.25 Partition group B size (PGBS) . 8214.26 Partition group B count (PGBC). 8214
34、.27 Vendor identifier (VNID). 8214.28 Last double-frame number (LDFN) 8214.29 Last valid system zone (LVSZ) 8214.30 Last valid partition (LVPT) . 8214.31 Volume identifier (VLID). 82Copyright American National Standards Institute Provided by IHS under license with ANSI Not for ResaleNo reproduction
35、or networking permitted without license from IHS-,-,-vPage15Helical track and double-frame types. 8315.1 Helical track types 8315.1.1 Data track. 8315.1.2 Amble track 8415.1.3 Demark track 8415.1.4 Beginning-of-media track . 8415.1.5 End-of-recording track 8515.1.6 End-of-recording temporary track .
36、 8515.1.7 End-of-recording error track 8615.2 Types of double-frame . 8715.2.1 Data physical-block double-frame 8715.2.2 Demark double-frame 8715.2.3 Beginning-of-media (BOM) double-frame 8715.2.4 End-of-recording (EOR) double-frame. 8715.2.5 End-of-recording temporary (EOR/T) double-frame . 8715.2.
37、6 End-of-recording error (EOR/E) double-frame 8715.2.7 Amble double-frame. 8816Logical format. 8916.1 Logical layer overview 8916.2 Logical entities . 8916.2.1 Data block 8916.2.2 Byte stream 8916.2.3 Physical-block 8916.2.4 File section. 9116.2.5 Partition 9216.2.5.1 Beginning-of-partition (BOP) vs
38、. beginning-of-media (BOM). 9316.2.5.2 File sections in a partition. 9316.2.5.3 End-of-recording (EOR) . 9316.2.5.3.1 Normal end-of-recording (EOR). 9316.2.5.3.2 Temporary end-of-recording (EOR/T) 9516.2.5.3.3 Error end-of-recording (EOR/E) . 9616.2.5.4 End-of-partition (EOP) 9716.2.5.5 End-of-media
39、 warning 9716.2.5.6 Partition initialization 9716.2.5.7 Append recording. 9716.2.5.8 Longitudinal track format in a partition . 9816.2.6 Physical volume . 9816.2.6.1 Zone definitions 9816.2.6.1.1 Beginning-of-tape (BOT) zone . 9816.2.6.1.2 Volume format information (VFI) zone . 10016.2.6.1.3 System
40、zone 10016.2.6.1.4 Information zone 10116.2.6.1.5 End-of-tape (EOT) zone. 10116.2.6.2 Partition options . 10116.2.6.2.1 Single partition volume. 10116.2.6.2.2 Multiple partition volume 10116.3 Volume format information (VFI) 10216.3.1 Volume specific parameters. 10216.3.2 Partition group parameters.
41、 10316.3.2.1 Supported partition group formats 103Copyright American National Standards Institute Provided by IHS under license with ANSI Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-viPage16.3.2.2 Partition layout option (PTLO) . 10416.3.2.3 Pack. 10416.3.2.4 S
42、tretch . 10516.3.2.5 Waste. 10516.3.2.6 Alternate 10516.3.2.7 An example multiple partition volume with system zones 10516.4 Volume initialization requirements . 10516.5 Pre-formatted tape. 106AnnexesASummary of formatted helical track array. 108BSummary of helical and longitudinal recording format
43、. 109CSummary of PATS and LATS contents 110DHelical track content data physical-block double-frame 111EMethod of measuring recording tape abrasivity: 112Tables1Mechanical tolerances 202Cassette identification and length 203Manufacturers hole set definition. 214User holes for small (Type 1), medium a
44、nd large cassettes 225User holes for small cassette (Type 2). 226Reel spring force 237Record locations and dimensions (single density) . 508Record locations and dimensions (double density) 519Servo mark identifier bit sequences . 6010PATS format bit definition. 6311Format identifier definition 6312L
45、ATS-I Format bit definition 6513LATS-II Format bit definition. 6614LATS-III Format bit definition 6715Zone type . 6716Partition layout options definitions 6817Definition of logical format data, sub-blocks 0, 2 and(b) a magnetic tape of 19 mm (0.748 in) nominal width held inside the case on twinhubs.
46、 The tape shall be transported between the hubs for digital recording at thedensities specified in this standard for either single or double density operation.In addition, this standard specifies the physical and magnetic requirements for the magnetic tapeand its cassette, the details of the logical
47、 and physical format, and the test methods for verifyingcompliance with these requirements.Caution: It is possible that compliance with this standard may require the use of an inventionprotected by patent rights. The sponsor of this standard has filed a statement of willingness togrant a license und
48、er these rights on reasonable and nondiscriminatory terms and conditions toapplicants desiring to obtain such a license; however, no warranty is made or implied that thisis the only license that may be required to avoid patent infringement in the use of this standard.American National Standard for I
49、nformation Technology 19 mm DD-2 Helical Scan DigitalComputer Tape Cassettefor Information InterchangeAMERICAN NATIONAL STANDARD ANSI NCITS 328-2000Copyright American National Standards Institute Provided by IHS under license with ANSI Not for ResaleNo reproduction or networking permitted without license from IHS-,
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