ANSI INCITS311-1998 Information Technology - Magnetic Tape Format for Information Interchange - 128-Track Parallel Serpentine 12.65 mm (1 2 in) 3400 bpmm (86 360 bpi) Run Length Re.pdf

1、ANSI INCITS 311-1998 (R2003)(formerly ANSI NCITS 311-1998)for Information Technology Magnetic Tape Formatfor Information Interchange128-Track, Parallel Serpentine 12.65 mm(1/2 in), 3400 bpmm (86 360 bpi)Run Length Limited RecordingCopyright American National Standards Institute Provided by IHS under

2、 license with ANSINot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Copyright American National Standards Institute Provided by IHS under license with ANSINot for ResaleNo reproduction or networking permitted without license from IHS-,-,-American National Standardfor

3、 Information Technology Magnetic Tape Formatfor Information Interchange128-Track, Parallel Serpentine 12.65 mm(1/2 in), 3400 bpmm (86 360 bpi)Run Length Limited RecordingANSINCITS 311-1998SecretariatInformation Technology Industry CouncilApproved April 28, 1998American National Standards Institute,

4、Inc.Copyright American National Standards Institute Provided by IHS under license with ANSINot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Approval of an American National Standard requires verification by ANSI thatthe requirements for due process, consensus, and o

5、ther criteria for approvalhave been 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. Substantial agreement means much more thana simple majority, b

6、ut 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 in any respect preclude anyone, whether he has approvedthe

7、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 interpretation on any American NationalStandard. Moreover, no

8、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 name appears on the titlepage of this standard.CAUTION NOTI

9、CE: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 American National Standards mayreceive current information on a

10、ll 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 Industry Council (ITI)All rights reserved.No part of this publi

11、cation 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 of patents that may be re-quired for the implementation of

12、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 this standard, following calls for the identification of pate

13、nts 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 therewith. The known patent holder(s) has (have), however,

14、 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 search is conducted by the developer or publisher in respect t

15、o any standard itprocesses. No representation is made or implied that this is the only license that may be required toavoid infringement in the use of this standard.Copyright American National Standards Institute Provided by IHS under license with ANSINot for ResaleNo reproduction or networking perm

16、itted without license from IHS-,-,-iContentsPageForeword.iv1Scope, purpose, and application 11.1 Scope . 11.2 Purpose 11.3 Application 11.3.1 Conformance 12Normative references. 13Definitions. 24Tape characteristics . 65Recording. 65.1 Physical recording density 65.2 Bit-cell length 65.3 Average bit

17、-cell length 65.3.1 Long-term average bit-cell length. 65.3.2 Short-term average bit-cell length 75.4 Bit rate of change . 75.5 Bit shift 75.6 Total character skew 75.7 Missing zero-crossing zones 75.8 Coincident missing zero-crossing zones 76Data track format 86.1 Number of data tracks 86.2 Track p

18、ositions . 86.3 Track width. 106.4 Azimuth 106.5 Track identification . 107Tape format 107.1 General. 107.2 Recording area. 107.3 Tach count 127.4 Physical blocks. 127.5 Servo acquisition region. 137.6 Volume control region 137.7 Data region. 137.8 Data entities . 148Packet format . 168.1 Packet hea

19、der 178.2 Packet data 208.3 Packet trailer 209Device blocks . 209.1 Data device blocks . 209.2 Mark device blocks. 219.3 Filemark mark. 21Copyright American National Standards Institute Provided by IHS under license with ANSINot for ResaleNo reproduction or networking permitted without license from

20、IHS-,-,-iiPage9.4 Void mark . 219.5 Beginning of half-wrap mark. 219.6 End of half-wrap mark 229.7 BOP mark. 229.8 EOD mark. 229.9 SDM mark 229.10 FID mark. 239.11 DBM mark 259.11.1 DBM general information packet 259.11.2 DBM wrap region packet 259.11.3 DBM partitions packet 269.11.4 DBM servo demar

21、k packet. 279.11.5 DBM filemark packet 289.12 SARS mark. 289.13 DBM checked out mark 289.14 DBM valid mark 2810Device block format 2910.1 Device block header. 2910.1.1 Device block control . 2910.1.2 Device block sequence control. 3210.1.3 Device block device information. 3210.2 Device block data. 3

22、310.3 Device block trailer. 3311ECC 3311.1 CRC 3311.2 Code block . 3411.3 ECC-encoded code block. 3411.4 Codeword correction code generation . 3511.5 MIE pointer code generation 3611.6 ECC-encoded interleave unit . 3611.7 Short error correction code generation. 3712Recording of bytes on tape 3912.1

23、Synchronization format. 3912.2 Interblock gap formatting 4212.3 RLL byte translation . 4212.4 Write equalization bit translation 4312.5 Writing bits on tape. 43Tables1Data Track Positions 92Track Identification . 103Region Dimensions 124Packet Types 195Device Block Types 316Sync Characters. 397RLL E

24、ncoder Table 438Write Equalizer Encoder Table. 43Copyright American National Standards Institute Provided by IHS under license with ANSINot for ResaleNo reproduction or networking permitted without license from IHS-,-,-iiiPageFigures1Usable Recording Area 112Regions On Tape . 113Data Entities for Lo

25、gical Block 154Data entities for device block 165Data Packet 166Mark Packet 177Device Block. 298Device Block Header 299CRC 3410ECC-Encoded Code Block . 3511ECC 3612ECC-Encoded Interleave Unit 3713Positioning of SECC . 3814SECC odd bytes . 3815SECC even bytes . 3816Positioning of Synchronizing Featur

26、es Beginning . 4017Positioning of Synchronizing Features End. 4018Placement of Synchronization Characters Beginning . 4019Placement of Synchronization Characters Middle. 4120Placement of Synchronization Characters End . 4121Synchronization Characters for One- and Two-MIU Device Blocks . 4122Synchron

27、ization Characters for Three-MIU Device Block 42AnnexesAMeasurement of bit shift . 44A.1 Read equipment . 44A.2 Measurement 45A.3 Data analysis 45BVendor code lists 46CBibliography 47Copyright American National Standards Institute Provided by IHS under license with ANSINot for ResaleNo reproduction

28、or networking permitted without license from IHS-,-,-ivForeword(This foreword is not part of American National Standard NCITS 311-1998.)This standard presents format and recording requirements for 12.65 mm (0.50 in)128-track magnetic tape to be used for information interchange among processingsystem

29、s, communication systems, and associated equipment. This standard dealssolely with recording on magnetic tape.The X3B5 Subcommittee on Digital Magnetic Tape, which developed this standard,consists of experienced and qualified specialists in manufacturing magnetic tape,and in recording digital inform

30、ation on magnetic tape. This standard is the fourth toutilize this cartridge form factor and the first to use the new metal particle tape. Therecording format represents a significant advancement in reliability and volumetric ef-ficiency for 12.65 mm (0.50 in) magnetic tape. In the development of th

31、is standard,careful consideration was given to current practices, existing equipment and sup-plies, and the broadest possible acceptance, and to providing a basis for future im-provements in the use of the cartridge medium.There are three annexes in this standard. Annex A is normative and is conside

32、redpart of this standard. Annex B and annex C are informative and are not consideredpart of this standard.Requests for interpretation, suggestions for improvement or addenda, or defect reportsare welcome. They should be sent to National Committee for Information TechnologyStandards (NCITS), ITI, 125

33、0 Eye Street, NW, Suite 200, Washington, DC 20005. This standard was processed and approved for submittal to ANSI by NCITS. Commit-tee approval of this standard does not necessarily imply that all members voted for itsapproval. At the time it approved this standard, NCITS had the following members:K

34、aren Higginbottom, Chair(Vacant), Vice-ChairMonica Vago, SecretaryOrganization Represented Name of RepresentativeAMP, IncJohn HillCharles Brill (Alt.)Apple Computer, IncDavid K. MichaelJerry Kellenbenz (Alt.)AT VCR region; data region.Table 3 Region DimensionsDimension Minimum Nominal Maximumd1 5.4

35、m (213 in)d2 8.0 m (315 in) 8.3 m (327 in) 8.6 m (339 in)d3 11.0 m (433 in) 11.4 m (449 in) 11.8 m (465 in)d4 2.0 m (79 in) d5 11.5 m (453 in)d6 17.8 m (701 in) d7 1.0 m (39 in) d8 2.5 m (98 in) d9 d8 d9 d8 d9 d8 d9d10 d9 d10 d9 d10 d9 d107.3 Tach countTwo tach counters provide information about the

36、 position of tape relative to the load point.Tach counter C is a 4-byte counter which is reset to 0000000016when the cartridge leader block isinserted into the machine reel. Tach counter C shall increment by 512 units for each 360 rotation of thecartridge reel when the tape is moved in the physical

37、forward direction, and shall decrement by 512 unitsfor each 360 rotation of the cartridge reel when the tape is moved in the physical reverse direction.Tach counter M is a 4-byte counter which is reset to 0000000016when the cartridge leader block isinserted into the machine reel. Tach counter M shal

38、l increment by 512 units for each 360 rotation of themachine reel when the tape is moved in the physical forward direction, and shall decrement by 512 unitsfor each 360 rotation of the machine reel when the tape is moved in the physical reverse direction. Thediameter of the machine reel without tape

39、 shall be 50.06 mm +0.00 mm, -0.05 mm (1.971 in +0.000 in,-0.002 in).The tach count shall be taken from tach counter C when tape is moving in the physical forward direction.The tach count shall be taken from tach counter M when tape is moving in the physical reverse direction.7.4 Physical blocksInfo

40、rmation in the VCR and data regions is recorded on the media as one of two types of physical blocks:mark physical blocks and data physical blocks.A mark physical block contains no host data. It is used to indicate special conditions such as delimitersand format identification. The data content of th

41、e mark physical block is described in clause 9.A data physical block contains logical block information.An interblock gap shall be recorded before and after each physical block.Copyright American National Standards Institute Provided by IHS under license with ANSINot for ResaleNo reproduction or net

42、working permitted without license from IHS-,-,-ANSI NCITS 311-199813The mark and data physical blocks are made up of the following entities: code block four-byte CRC; synchronization character; resynchronization burst; acquisition burst; synchronization burst interval; modulation triplet; modulation

43、 character.7.5 Servo acquisition regionThe servo acquisition region (SAQ) is used by the track following servo. The servo format is not specifiedby this standard. The servo acquisition region shall not contain recorded data information.7.6 Volume control regionThe volume control region (VCR) is loca

44、ted at the beginning of wrap 0 immediately following the servoacquisition region (SAQ). The VCR contains the following marks: format identification (FID) mark; device block map (DBM) mark; statistical analysis and reporting system (SARS) mark; DBM Valid mark or DBM Checked Out mark. Format identific

45、ation (FID) mark: The FID mark is the first entity recorded on the tape. The FIDidentifies the format that was used to write the data area of the physical volume. The FID is also thereference point from which distance along the tape is measured. Device block map (DBM) mark: The DBM mark immediately

46、follows the FID mark and containsinformation which may be written and used by the system to determine the location of the partition, mediadefects, and recorded elements. Statistical analysis and reporting system (SARS) mark: The SARS mark immediately follows the DBMmark. The SARS mark contains infor

47、mation about the performance of the tape. DBM Valid mark: The DBM Valid mark, if present, immediately follows the SARS mark. The presenceof the DBM valid mark indicates that the DBM mark is valid. When a cartridge is opened, this mark isoverwritten by the DBM Checked Out mark. DBM Checked Out mark:

48、The DBM Checked Out mark, if present, immediately follows the SARS mark.The presence of the DBM Checked Out mark indicates that the DBM mark is not valid. When the cartridgeis closed, this mark is overwritten by the DBM Valid mark if the information in the DBM is accurate.7.7 Data regionThe data reg

49、ion is the portion of tape used to record data and marks. Nominally, it is located betweenlogical point 1 and logical point 2 for the outbound half-wraps, and between logical point 2 and logical point3 for the inbound half-wraps.Copyright American National Standards Institute Provided by IHS under license with ANSINot for ResaleNo reproduction or networking permitted wi