1、INTERNATIONAL STANDARD ISOAEC 15307 First edition 1997-l 2-01 Information technology - Data interchange on 12,7 mm 128track magnetic tape cartridges - DLT 4 format Technologies de /information - khange de donnees sur cat-touches de bande magrkfique de 12,7 mm, 728 pistes - format DLT 4 Reference num
2、ber ISO/IEC 15307:1997(E) ISO/IEC 15307: 1997 (E) Contents Page 1 1 Section 1 - General 1 Scope 2 Conformance 2.1 Magnetic tape cartridges 2.2 Generating systems 2.3 Receiving systems 3 Normative references 4 Definitions 4.1 Average Signal Amplitude 4.2 azimuth 4.3 back surface 4.4 Beginning-Of-Tape
3、 marker (BOT) 4.5 byte 4.4 cartridge 4.7 Cyclic Redundancy Check (CRC) character 4.8 Early Warning (EW) 4.9 Error-Detecting Code (EDC) 4.10 End-Of-Tape marker (EOT) 4.11 Entity 4.12 Error-Correcting Code (ECC) 4.13 flux transition position 4.14 flux transition spacing 4.15 Logical Block 4.16 logical
4、 track 4.17 magnetic tape 4.18 Master Standard Reference Tape 4.19 object 4.20 page 4.21 physical block 4.22 physical recording density 4.23 physical track 4.24 Record 4.25 Reference Edge 4.26 Reference Field 4.27 Secondary Standard Reference Tape 4.28 Standard Reference Amplitude (SRA) 4.29 Standar
5、d Reference Current 4.30 Test Recording Current 4.31 Typical Field OlSO/lEC 1997 All rights reserved. Unless otherwise specified no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanrcal, including photocopying and microfilm, without permission i
6、n writing from the publisher ISO/IEC Copyright Office . Case Postale 56 . CH-1211 Geneve 20 Switzerland Printed in Switzerland ii OISOAEC ISOLIEC 15307:1997(E) 5 Conventions and notations 5.1 Representation of numbers 5.2 Dimensions 5.3 Names 5.4 Acronyms 6 Environment and safety 6.1 Cartridge and t
7、ape testing environment 6.2 Cartridge operating environment 6.3 Cartridge storage environment 6.4 Safety 6.4.1 Safeness 6.4.2 Flammability 6.5 Transportation Section 2 - Requirements for the unrecorded tape 7 Mechanical and electrical requirements 7.1 Material 7.2 Tape length 7.3 Width 7.4 Total thi
8、ckness 7.5 Discontinuity 7.6 Longitudinal curvature 7.6.1 Requirement 7.6.2 Procedure 7.7 Out-of-Plane distortions 7.8 Cupping 7.9 Roughness of the coating surfaces 7.9.1 Roughness of the back coating surface 7.9.2 Roughness of the magnetic coating surface 7.10 Coating adhesion 7.11 Layer-to-layer a
9、dhesion 7.11.1 Requirements 7.11.2 Procedure 7.12 Modulus of elasticity 7.12.1 Requirement 7.12.2 Procedure 7.13 Flexural rigidity 7.13.1 Requirement 7.13.2 Procedure 7.14 Tensile yield force 7.14.1 Procedure 7.15 Electrical resistance 7.15.1 Requirement 7.15.2 Procedure 7.16 Inhibitor tape 7.17 Abr
10、asivity 3 3 3 3 3 4 4 4 4 4 4 4 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 6 6 6 6 6 7 7 7 7 7 8 8 8 8 8 8 9 9 III ISO/IEC 15307:1997(E) OISO/IEC 7.17.1 Requirement 7.17.2 Procedure 7.18 Light transmittance of the tape and the leader 7.19 Coefficient of dynamic friction 7.19.1 Requirements 7.19.2 Procedure for t
11、he measurement of the friction between the magnetic surface and the back surface 7.19.3 Procedure for the measurement of the friction between the magnetic surface or the back surface and calcium 9 9 9 9 10 10 titanate ceramic 10 8 Magnetic recording characteristics 8.1 Typical Field 8.2 Signal ampli
12、tude 8.3 Resolution 8.4 Overwrite 10 11 11 11 11 8.4.1 Requirement 8.5 Peak shift 11 11 8.5.1 Requirement 8.5.2 Procedure 11 11 9 Tape quality 12 9.1 Missing pulses 9.1.1 Requirement 9.2 Missing pulse zone 9.2.1 Requirement 9.3 Tape durability Section 3 - Mechanical specifications of the tape cartri
13、dge 10 General 12 12 12 12 12 10.1 Bottom side and right side 10.2 Back side and left side 10.3 Tape reel 10.4 Tape leader 10.5 Front side 10.6 Operation of the cartridge 10.7 Tape winding 10.8 Moment of inertia 10.9 Material 12 12 13 14 14 15 16 17 17 17 18 Section 4 - Requirements for an interchan
14、ged tape 27 11 Method of recording 27 11.1 Physical recording density 27 11.2 Channel bit cell length 27 11.2.1 Average Channel bit cell length 27 11.2.2 Long-term average Channel bit cell length 27 11.2.3 Short-term average Channel bit cell length 27 11.3 Flux transition spacing 27 11.4 Read signal
15、 amplitude 27 11.5 Azimuth 28 11.6 Channel skew 28 12 Tape format 28 iv OISO/IEC ISO/IEC 15307:1997(E) 12.1 Reference Edge 12.2 Direction of recording 12.3 Tape layout 12.4 Calibration and Directory Area 12.4.1 Scratch Area 12.4.2 Guard Area G 1 12.4.3 Calibration Tracks Area 12.4.4 Guard Area G2 12
16、.4.5 Directory Area 12.4.6 Guard Area G3 12.5 Data Area 12.5.1 Physical tracks 12.5.2 Width of the physical tracks 12.5.3 Logical tracks 12.5.4 Locations of the physical tracks 12.5.5 Layout of tracks in the Data Area 13 Data format 13.1 Data Bytes 13.2 Logical Blocks 13.3 Data Blocks 13.4 Types of
17、Logical Blocks 13.5 Entities 13.6 Logical Block format 13.6.1 Preamble 13.6.2 Sync 30 31 31 31 31 32 32 33 33 33 33 33 33 13.6.3 Data Field 13.6.4 EDC 13.6.5 Control Field 1 (CFI ) 13.6.6 Control Field 2 (CF2) 13.6.7 CRC 13.6.8 Postamble 14 Use of Logical Blocks 14.1 Data Blocks 14.2 Filler Blocks 1
18、4.3 End of Track Blocks (EOTR) 14.4 End of Data Blocks (EOD) 14.5 ECC Blocks 15 Format of Entities 16 Error handling Annexes 34 34 34 36 36 37 38 38 38 38 38 39 39 39 39 39 A - Measurement of light transmittance 40 B - Generation of the Data Block CRCS 43 C - ECC generation 44 D - Generation of page
19、 CRCs 47 E - Format of MAP entries 48 F - Format of Control Field 1 49 G - Format of Control Field 2 50 H - Recommendations for transportation 51 28 28 28 28 29 29 29 30 30 30 V ISO/IEC 15307:1997(E) J - Inhibitor tape K - Recommendations on tape durability L - Handling guidelines QISO/IEC 52 53 54
20、vi OISO/IEC ISO/IEC 15307:1997(E) Foreword IS0 (the International Organization for Standardization) and IEC (the International Electrotechnical Commission) form the specialized system for worldwide standardization. National bodies that are members of IS0 or IEC participate in the development of Inte
21、rnational Standards through technical committees established by the respective organization to deal with particular fields of technical activity. IS0 and IEC technical committees collaborate in fields of mutual interest. Other international organizations, governmental and non-governmental, in liaiso
22、n with IS0 and IEC, also take part in the work. In the field of information technology, IS0 and IEC have established a joint technical committee, ISO/IEC JTC 1. Draft International Standards adopted by the joint technical committee are circulated to national bodies for voting. Publication as an Inte
23、rnational Standard requires approval by at least 75% of the national bodies casting a vote. International Standard ISO/IEC 15307 was prepared by ECMA (as ECMA-231) and was adopted, under a special “fast-track procedure”, by Joint Technical Committee ISO/IEC JTC 1, Information technology, in parallel
24、 with its approval by national bodies of IS0 and IEC. Annexes A to G form an integral part of this International Standard. Annexes H to L are for information only. vii ISO/IEC 15307:1997(E) OISO/IEC Introduction This International Standard constitutes a further development of the family of DLT-forma
25、tted magnetic tape cartridges. It allows for a capacity of 20 Gbytes of uncompressed data, or, typically, of 40 Gbytes of compressed user data. . . VIII INTERNATIONAL STANDARD 0 ISO/IlX ISO/IEC 15307:1997 (E) Information technology - Data interchange on 12,7 mm 128track magnetic tape cartridges - DL
26、T 4 format Section 1 - General 1 Scope This International Standard specifies the physical and magnetic characteristics of a 12,7 mm wide, 12%track magnetic tape cartridge, to enable interchangeability of such cartridges. It also specifies the quality of the recorded signals, a format - called Digita
27、l Linear Tape 4 (DLT 4) - and a recording method. Together with a labelling standard, for instance IS0 1001 for Magnetic Tape Labelling, it allows full data interchange by means of such magnetic tape cartridges. 2 Conformance 2.1 Magnetic tape cartridges A magnetic tape cartridge shall be in conform
28、ance with this International Standard if it satisfies all mandatory requirements of this International Standard. The tape requirements shall be satisfied throughout the extent of the tape. 2.2 Generating systems A system generating a magnetic tape cartridge for interchange shall be entitled to claim
29、 conformance with this International Standard if all the recordings that it makes on a tape according to 2.1 meet the mandatory requirements of this International Standard. 2.3 Receiving systems A system receiving a magnetic tape cartridge for interchange shall be entitled to claim conformance with
30、this International Standard if it is able to handle any recording made on a tape according to 2. I. 3 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions
31、indicated were valid. All standards are subject to revision, and parties to ag- reements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and IS0 maintain registers of currently va
32、lid International Standards. IS0 1001: 1986, Information processing - File structure and labelling of magnetic tapes for information interchange. IS0 1302: 1992, Technical drawings - Method of indicating sulfate texture. 4 Definitions For the purposes of this International Standard, the following de
33、finitions apply. 4.1 Average Signal Amplitude The average peak-to-peak value of the output signal from the read head at the physical recording density of 2 142 ftpmm measured over a minimum length of track of 25,4 mm, exclusive of missing pulses. 4.2 azimuth The angular deviation, in minutes of arc,
34、 of the mean flux transition line of the recording made on a track from 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 marker (BOT) A hole punched on the centreline of the tape towards
35、the 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 1 ISO/IEC 15307:1997 (E) OISO/IEC 4.6 cartridge A case containing a single supply reel of 12,7 mm wide magnetic tape with a leader attached at the out
36、er end. 4.7 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 comput
37、ation yielding 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 the leader. 4.11 Entity A group of ten Logical Blocks treated as a logical unit and recorded on a logical track. 4.12 Error-Correcting Code (E
38、CC) A mathematical computation yielding check bytes used for the correction of errors 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 tape surface. 4.14 flux transition spacing The distance on the magnetic tape
39、 between successive flux transitions. 4.15 Logical Block The two physical blocks simultaneously written on, or read from, the two physical tracks of a logical 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 retai
40、ns magnetic signals intended for input, output, and storage purposes on 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 Refe
41、rence Tape has been established 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
42、recorded flux transitions per unit length of track, expressed in flux transitions 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 hos
43、t. 2 OISO/IEC ISO/IEC 15307:1997 (E) 4.25 Reference Edge The bottom edge of the tape when viewing the magnetic coating of the tape with the BOT to the left and the EOT to the right of the observer. 4.26 Reference Field The Typical Field of the Master Standard Reference Tape. 4.27 Secondary Standard
44、Reference Tape A tape the characteristics of which are known and stated in relation to those of the Master Standard Reference Tape. Note - Secondary Standard Reference Tapes can be ordered under Reference “SSRT/DLT4” until the year 200.5 from Quantum Corporation, 333 South Street, Shrewsbury, Mass.
45、01545-4195, USA. It is intended that these be used for calibrating tertiary reference tapes for routine calibration 4.28 Standard Reference Amplitude (SRA) The Average Signal Amplitude from the Master Standard Reference Tape when it is recorded with the Test Recording Current at 2 142 ftpmm. 4.29 St
46、andard Reference Current The current that produces the Reference Field. 4.30 Test Recording Current The current that is 1,l times the Standard Reference Current. 4.31 Typical Field In the plot of the Average Signal Amplitude against the recording field at the physical recording density of 2 142 ftpm
47、m, the minimum field that causes an Average Signal Amplitude equal to 95 % of the maximum Average Signal Amplitude. 5 Conventions and notations 5.1 Representation of numbers The following conventions and notations apply in this Standard, unless otherwise stated. - A measured value is rounded off to
48、the least significant digit of the corresponding specified value. It implies that a specified value of 1,26 with a positive tolerance +O,Ol, and a negative tolerance -0,02 allows a range of measured values from 1,235 to 1,275. - In each block and in each field the bytes shall be arranged with Byte 1
49、, the least significant, first. Within each byte the bits shall 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 redundancy characters. - Letters and digits in parentheses represent numbers in hexadecimal notation - The setting of bits is denoted by ZERO or ONE
