1、 INCITS/ISO/IEC 15895:19992010 (ISO/IEC 15895:1999, IDT) Information technology - Data interchange on 12,7 mm 128-track magnetic tape cartridges - DLT 3-XT format Reaffirmed as INCITS/ISO/IEC 15895:1999 R2015INCITS/ISO/IEC 15895:19992010PDF disclaimerThis PDF file may contain embedded typefaces. In
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3、es licensing policy. The ISO Central Secretariat accepts no liability in this area.Adobe is a trademark of Adobe Systems Incorporated.Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters were optimized for pr
4、inting. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below.Adopted by INCITS (InterNational Committee for Information Technology Sta
5、ndards) as an American National Standard.Date of ANSI Approval: 9/29/2010Published by American National Standards Institute, 25 West 43rd Street, New York, New York 10036Copyright 2010 by Information Technology Industry Council (ITI). All rights reserved.These materials are subject to copyright clai
6、ms of International Standardization Organization (ISO), International Electrotechnical Commission (IEC), American National Standards Institute (ANSI), and Information Technology Industry Council (ITI). Not for resale. No part of this publication may be reproduced in any form, including an electronic
7、 retrieval system, without the prior written permission of ITI. All requests pertaining to this standard should be submitted to ITI, 1101 K Street NW, Suite 610, Washington DC 20005.Printed in the United States of Americaii ITIC 2010 All rights reserved ISO/IECISO/IEC 15895:1999 (E)iv4.30 Test Recor
8、ding Current 34.31 Typical Field 35 Conventions and notations 35.1 Representation of numbers 35.2 Dimensions 35.3 Names 35.4 Acronyms 36 Environment and safety 36.1 Cartridge and tape testing environment 46.2 Cartridge operating environment 46.3 Cartridge storage environment 46.4 Safety 46.4.1 Safen
9、ess 46.4.2 Flammability 46.5 Transportation 4Section 2 - Requirements for the unrecorded tape 57 Mechanical and electrical requirements 57.1 Material 57.2 Tape length 57.3 Width 57.4 Total thickness 57.5 Discontinuity 57.6 Longitudinal curvature 57.6.1 Requirement 57.6.2 Procedure 57.7 Out-of-Plane
10、distortions 57.8 Cupping 57.9 Roughness of the coating surfaces 57.9.1 Roughness of the back coating surface 57.9.2 Roughness of the magnetic coating surface 57.10 Coating adhesion 67.11 Layer-to-layer adhesion 67.11.1 Requirements 67.11.2 Procedure 67.12 Modulus of elasticity 77.12.1 Requirement 77
11、.12.2 Procedure 77.13 Flexural rigidity 77.13.1 Requirement 77.13.2 Procedure 87.14 Tensile yield force 87.14.1 Procedure 87.15 Electrical resistance 87.16.1 Requirement 87.15.2 Procedure 87.16 Inhibitor tape 97.17 Abrasivity 97.17.1 Requirement 97.17.2 Procedure 97.18 Light transmittance of the tap
12、e and the leader 97.19 Coefficient of dynamic friction 97.19.1 Requirements 97.19.2 Procedure for the measurement of the friction between the magnetic surface and the back surface 10v7.19.3 Procedure for the measurement of the friction between the magnetic surface or the back surface and calciumtita
13、nate ceramic 108 Magnetic recording characteristics 108.1 Typical Field 118.2 Signal amplitude 118.3 Resolution 118.4 Overwrite 118.4.1 Requirement 118.5 Peak shift 118.5.1 Requirement 118.5.2 Procedure 119 Tape quality 129.1 Missing pulses 129.1.1 Requirement 129.2 Missing pulse zone 129.2.1 Requir
14、ement 129.3 Tape durability 12Section 3 - Mechanical specifications of the tape cartridge 1210 General 1210.1 Bottom side and right side 1310.2 Back side and left side 1410.3 Tape reel 1410.4 Tape leader and markers 1510.5 Front side 1610.6 Operation of the cartridge 1610.7 Tape winding 1710.8 Momen
15、t of inertia 1710.9 Material 1711 Method of recording 2611.1 Physical recording density 2611.2 Channel bit cell length 2611.2.1 Average Channel bit cell length 2611.2.2 Long-term average Channel bit cell length 2611.2.3 Short-term average Channel bit cell length 2611.3 Flux transition spacing 2611.4
16、 Read signal amplitude 2611.5 Azimuth 2711.6 Channel skew 2712 Tape format 2712.1 Reference Edge 2712.2 Direction of recording 2712.3 Tape layout 2712.4 Calibration and Directory Area 2712.4.1 Scratch Area 2812.4.2 Guard Area G1 2812.4.3 Calibration Tracks Area 2812.4.4 Guard Area G2 2912.4.5 Direct
17、ory Area 2912.4.6 Guard Area G3 2912.5 Data Area 2912.5.1 Physical tracks 3012.5.2 Width of the physical tracks 30ISO/IEC 15895:1999 (E)ISO/IECvi12.5.3 Logical tracks 3012.5.4 Locations of the physical tracks 3012.5.5 Layout of tracks in the Data Area 3113 Data format 3113.1 Data Bytes 3213.2 Logica
18、l Blocks 3213.3 Data Blocks 3213.4 Types of Logical Blocks 3213.5 Entities 3213.6 Logical Block format 3213.6.1 Preamble 3313.6.2 Sync 3313.6.3 Data Field 3313.6.4 EDC 3513.6.5 Control Field 1 (CF1) 3513.6.6 Control Field 2 (CF2) 3613.6.7 CRC 3713.6.8 Postamble 3714 Use of Logical Blocks 3714.1 Data
19、 Blocks 3714.2 Filler Blocks 3714.3 End of Track Blocks (EOTR) 3814.4 End of Data Blocks (EOD) 3814.5 ECC Blocks 3815 Format of Entities 3816 Error handling 38AnnexesA - Measurement of light transmittance 39B - Generation of the Data Block CRCs 42C - ECC generation 43D - Generation of page CRCs 46E
20、- Format of MAP entries 47F - Format of Control Field 1 48G - Format of Control Field 2 49H - Recommendations for transportation 50J - Inhibitor tape 51K - Recommendations on tape durability 52L - Handling guidelines 53ISO/IECISO/IEC 15895:1999 (E)ISO/IEC 15895:1999 (E)ISO/IECviiForewordISO (the Int
21、ernational Organization for Standardization) and IEC (the International Electrotechnical Commission)form the specialized system for worldwide standardization. National bodies that are members of ISO or IECparticipate in the development of International Standards through technical committees establis
22、hed by therespective organization to deal with particular fields of technical activity. ISO and IEC technical committeescollaborate in fields of mutual interest. Other international organizations, governmental and non-governmental, inliaison with ISO and IEC, also take part in the work.International
23、 Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3.In the field of information technology, ISO and IEC have established a joint technical committee, ISO/IEC JTC 1.Draft International Standards adopted by the joint technical committee are circulated to nationa
24、l bodies for voting.Publication as an International Standard requires approval by at least 75 % of the national bodies casting a vote.Attention is drawn to the possibility that some of the elements of this International Standard may be the subject ofpatent rights. ISO and IEC shall not be held respo
25、nsible for identifying any or all such patent rights.International Standard ISO/IEC 15895 was prepared by ECMA European association for standardizinginformation and communication systems (as ECMA-258) and was adopted, under a special “fast-track procedure”,by Joint Technical Committee ISO/IEC JTC 1,
26、 Information technology, in parallel with its approval by nationalbodies of ISO and IEC.Annexes A to G form a normative part of this International Standard. Annexes H to L are for information only.viiiIntroductionThis International Standard constitutes a further development of the magnetic tape cart
27、ridge specified in International StandardISO/IEC 14833. A higher capacity is achieved by using a thinner, thus longer tape.ISO/IECISO/IEC 15895:1999 (E)INTERNATIONAL STANDARD ISO/IEC ISO/IEC 15895:1999(E)ISO/IEC 15895:1999 (E) ISO/IEC24 DefinitionsFor the purposes of this International Standard, the
28、 following definitions apply.4.1 Average Signal Amplitude: The average peak-to-peak value of the output signal from the read head at thephysical recording density of 1 640 ftpmm measured over a minimum length of track of 25,4 mm, exclusive of missing pulses.4.2 azimuth: The angular deviation, in deg
29、rees of arc, of the mean flux transition line of the recording made on a trackfrom the line normal to the Reference Edge.4.3 back surface: The surface of the tape opposite the magnetic coating which is used to record data.4.4 Beginning-Of-Tape markers (BOT 1 and BOT 2): Two holes punched on the cent
30、reline of the tape towardsthe end nearest to the leader.4.5 byte: An ordered set of bits acted upon as a unit.Note - In this International Standard, all bytes are 8-bit bytes.4.6 cartridge: A case containing a single supply reel of 12,7 mm wide magnetic tape with a leader attached at theouter end.4.
31、7 Cyclic Redundancy Check (CRC) character: A 64-bit character, generated by a mathematical computation,used for error detection.4.8 Early Warning (EW): A signal generated by the drive indicating the approaching end of the recording area.4.9 Error-Detecting Code (EDC): A mathematical computation yiel
32、ding check bytes used for error detection.4.10 End-Of-Tape marker (EOT): A hole punched on the centreline of the tape towards the end farthest from theleader.4.11 Entity: A group of twenty physical blocks treated as a logical unit and recorded on a logical track.4.12 Error-Correcting Code (ECC): A m
33、athematical computation yielding check bytes used for the correction oferrors detected by the CRC and the EDC.4.13 flux transition position: The point which exhibits the maximum free-space flux density normal to the tapesurface.4.14 flux transition spacing: The distance on the magnetic tape between
34、successive flux transitions.4.15 Logical Block: The two physical blocks simultaneously written on, or read from, the two physical tracks of alogical track.4.16 logical track: A pair of physical tracks that are written or read simultaneously.4.17 magnetic tape: A tape that accepts and retains magneti
35、c signals intended for input, output, and storage purposeson computers and associated equipment.4.18 Master Standard Reference Tape: A tape selected as the standard for reference field, signal amplitude,resolution, peakshift, and overwrite characteristics.Note - The Master Standard Reference Tape is
36、 maintained by the Quantum Corporation.4.19 object: A Record or a Tape Mark Block.4.20 page: A logical division of a physical block.4.21 physical block: A set of contiguous bytes recorded on a physical track and considered as a unit.4.22 physical recording density: The number of recorded flux transi
37、tions per unit length of track, expressed in fluxtransitions per millimetre (ftpmm).4.23 physical track: A longitudinal area on the tape along which a series of magnetic signals can be recorded.4.24 Record: A collection of User Bytes, the number of which is determined by the host.4.25 Reference Edge
38、: The bottom edge of the tape when viewing the magnetic coating of the tape with the BOT holesto the left and the EOT hole to the right of the observer.4.26 Reference Field: The Typical Field of the Master Standard Reference Tape.4.27 Secondary Standard Reference Tape: A tape the characteristics of
39、which are known and stated in relation tothose of the Master Standard Reference Tape.ISO/IEC ISO/IEC 15895:1999 (E)3Note - Secondary Standard Reference Tapes can be ordered under Reference “SSRT/DLT3XT“ until the year 2003 from Quantum Corporation, 333 SouthStreet, Shrewsbury, Mass. 01545-4195, USA.
40、 It is intended that these be used for calibrating tertiary reference tapes for routine calibration.In principle, these Secondary Standard Reference Tapes will be available for a period of 10 years from the publication of the first version of this InternationalStandard. However, this period may be c
41、hanged to take into account the demand for such Secondary Standard Reference Tapes.4.28 Standard Reference Amplitude (SRA): The Average Signal Amplitude from the Master Standard ReferenceTape when it is recorded with the Test Recording Current at 1 640 ftpmm.4.29 Standard Reference Current: The curr
42、ent that produces the Reference Field.4.30 Test Recording Current: The current that is 1,1 times the Standard Reference Current.4.31 Typical Field: In the plot of the Average Signal Amplitude against the recording field at the physical recordingdensity of 1 640 ftpmm, the minimum field that causes a
43、n Average Signal Amplitude equal to 95 % of the maximum AverageSignal Amplitude.5 Conventions and notations5.1 Representation of numbersThe following conventions and notations apply in this International Standard, unless otherwise stated. In each block and in each field the bytes shall be arranged w
44、ith Byte 1, the least significant, first. Within each byte the bitsshall be arranged with Bit 1, the least significant, first and Bit 8, the most significant bit, last. This order applies to the data,and to the input and output of the error-detecting and error-correcting codes, and to the cyclic red
45、undancy characters. Letters and digits in parentheses represent numbers in hexadecimal notation. The setting of bits is denoted by ZERO or ONE. Numbers in binary notation and bit patterns are represented by strings of ZEROs and ONEs shown with the most significantbit to the left.5.2 DimensionsThe di
46、mensions in figures 1 to 4 are nominal dimensions. Unless otherwise stated, all dimensions in figures 8 to 23 are inmillimetres with a tolerance of 50 mm.5.3 NamesThe names of basic elements, e.g. specific fields, are written with a capital initial letter.5.4 AcronymsBOT 1 Beginning of Tape No. 1BOT
47、 2 Beginning of Tape No. 2CF1 Control Field 1CF2 Control Field 2CRC Cyclic Redundancy Check (character)ECC Error-Correcting CodeEDC Error-Detecting CodeEOD End of DataEOT End of TapeEOTR End of TrackEW Early WarningFCT1 Forward Calibration Track 1FCT2 Forward Calibration Track 2RCT1 Reverse Calibrat
48、ion Track 1RCT2 Reverse Calibration Track 2RLL Run Length LimitedSRA Standard Reference Amplitude6 Environment and safetyUnless otherwise stated, the conditions specified below refer to the ambient conditions in the test or computer room and not tothose within the tape drive.ISO/IEC 15895:1999 (E) I
49、SO/IEC46.1 Cartridge and tape testing environment.Unless otherwise stated, tests and measurements made on the cartridge and tape to check the requirements of this InternationalStandard shall be carried out under the following conditions. temperature: 23 C 2 C relative humidity: 40 % to 60 % conditioning before testing: 24 h6.2 Cartridge
