1、INTERNATIONAL STANDARD lSO/IEC 15521 First edition 1998-06-01 Information technology - 3,81 mm wide magnetic tape cartridge for information interchange - Helical scan recording - DDS-3 format using 125 m length tapes Technologies de /information - Cartouche de bande magnetique de 3,81 mm de large po
2、ur khange dinformation - Enregistrement par balayage en spirale - Format DDS3 utilisant des bandes de 125 m de long Reference number ISOAEC 15521:1998(E) ISO/IEC 15521:1998(E) Contents 1 Scope 1 2 Conformance 2.1 Magnetic tape cartridge 2.2 Generating drive 2.3 Receiving drive 3 Normative References
3、 2 4 Definitions 4.1 Absolute Frame Number (AFN) 4.2 a.c. erase 4.3 Access Point 4.4 algorithm 4.5 Area ID 4.6 Average Signal Amplitude 4.7 azimuth 4.8 back surface 4.9 byte 4.10 cartridge 4.1 1 Channel bit 4.12 Codeword 4.13 Data Format ID 4.14 Early Warning Point (EWP) 4.15 End of Data (EOD) 4.16
4、Entity 4.17 Error Correcting Code (ECC) 4.18 flux transition position 4.19 flux transition spacing 4.20 Fragment 4.21 Frame 4.22 Housekeeping Frame 4.23 Logical Beginning of Tape (LBOT) 4.24 magnetic tape 4.25 Master Standard Amplitude Calibration Tape 4.26 Master Standard Reference Tape 4.27 Optimu
5、m Recording Field 4.28 Partition Boundary 4.29 Physical Beginning of Tape (PBOT) 4.30 Physical End of Tape (PEOT) 4.3 1 physical recording density 4.32 pre-recording condition 4.33 processing 4.34 processed data 4.35 Processed Record 4.36 Processed Record Sequence 0 ISO/IEC 1998 All rights reserved.
6、 Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. ISOIIEC Copyright Office l Case postale 56 l CH-121 I Genkve 20 l Swit
7、zerland Printed in Switzerland 2 2 2 2 2 2 2 2 2 2 2 2 2 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 ii OISO/IEC ISO/IEC 15521:1998(E) 4.37 record 3 4.38 Reference Recording Field 3 4.39 reprocessing 4 4.40 Secondary Standard Amplitude Calibration Tape 4 4.4 1 Secondary Standard Reference Tape 4
8、 4.42 Separator Mark 4 4.43 Standard Reference Amplitude 4 4.44 Tape Reference Edge 4 4.45 Test Recording Current 4 4.46 track 4 4.47 unprocessed data 4 4.48 Unprocessed Record 4 4.49 Virtual End of Tape (VEOT) 4 5 Conventions and Notations 4 6 Acronyms 4 7 Environment and safety 7.1 Testing environ
9、ment 7.2 Operating environment 7.3 Storage environment 7.4 Transportation 7.5 Safety 7.6 Flammability 8 Dimensional and mechanical characteristics of the case 8.1 General 8.2 Overall dimensions 8.3 Loading grip 8.4 Holding areas 8.5 Notches of the lid 8.6 Lid dimensions 8.7 Optical detection of the
10、beginning and end of tape 8.8 Bottom side 8.8.1 Locking mechanism of the slider 8.8.2 Access holes 8.8.3 Recognition, sub-datums, and write-inhibit holes 8.8.4 Datum holes 8.8.5 Access room for tape guides 8.8.6 Holes for accessing the hubs 8.8.7 Internal structure of the lower half 8.8.8 Light path
11、 8.8.9 Support Areas 8.8.10 Datum Areas 8.8.11 Relationship between Support and Datum Areas and Reference Plane Z 8.9 Hubs 8.10 Attachment of leader and trailer tapes 8.11 Interface between the hubs and the drive spindles 8.12 Opening of the lid 8.13 Release of the hub locking mechanism 8.14 Label a
12、reas 8.15 Requirement for autoloaders 6 6 6 7 7 7 7 8 8 9 9 9 11 11 11 12 13 13 13 13 13 14 14 14 14 15 15 9 Mechanical, physical and dimensional characteristics of the tape 27 III ISO/IEC 15521:1998(E) OISO/IEC 9.1 Materials 9.2 Tape length 9.2.1 Length of magnetic tape 9.2.2 Length of leader and t
13、railer tapes 9.2.3 Length of splicing tapes 9.3 Tape width 9.3.1 Width of magnetic tape 9.3.2 Width of leader and trailer tapes 9.3.3 Width and position of splicing tape 9.3.4 Edge weave 9.4 Discontinuities 9.5 Tape thickness 95.1 Thickness of magnetic tape 9.5.2 Thickness of leader and trailer tape
14、 9.5.3 Thickness of splicing tape 9.6 Longitudinal curvature 9.7 Cupping 9.8 Coating adhesion 9.9 Layer-to-layer adhesion 9.10 Tensile strength 9. IO. 1 Breaking strength 9.10.2 Yield strength 9.1 1 Residual elongation 9.12 Flexural rigidity 9.13 Electrical resistance of coated surfaces 9.14 Light t
15、ransmittance of the tape 9.15 Media Recognition System (MRS) 10 Magnetic recording characteristics 10.1 Optimum Recording Field 10.2 Signal Amplitude 10.3 Resolution 10.4 Overwrite 10.5 Ease of erasure 10.6 Tape quality 10.6.1 Missing pulses 10.6.2 Missing pulse zone 10.7 Signal-to-Noise Ratio (SNR)
16、 characteristic 11 Format 1 1.1 General 11.2 Basic Groups 11.2.1 Entity 11.2.2 Group Information Table 11.2.3 Block Access Table (BAT) 11.3 Sub-Groups 11.3.1 Gl Sub-Group 1 1.3.2 G2 Sub-Group - randomizing 11.3.3 G3 Sub-Group 11.3.4 G4 Sub-Group 11.3.5 Main Data Fragment 11.3.6 Summary of the transf
17、ormation of a Basic Group 11.4 Sub code Information 27 27 27 27 27 27 27 27 27 27 29 29 29 29 29 29 29 29 30 30 30 30 30 31 31 32 32 33 34 34 34 34 34 34 34 35 35 36 36 36 37 38 39 42 42 42 43 44 48 50 50 iv OISO/IEC ISO/IEC 15521:1998(E) 1 1.4.1 Pack Item Number 0 50 11.4.2 Pack Item Number 1 50 1
18、I .4.3 Pack Item Number 2 51 1 I .4.4 Pack Item Number 3 51 1 I .4.5 Pack Item Number 4 51 1 1.4.6 Pack Item Number 5 52 I 1.4.7 Pack Item Number 6 52 1 1.4.8 Pack Item Number 7 53 11.4.9 Pack Item Number 8 53 1 I .4.10 Pack Item Number 9 54 1 1.4.1 1 Pack Item Number 10 54 1 1.4.12 Pack Item Number
19、 1 1 54 1 1.4.13 Pack Item Number 12 55 11.4.14 Pack Item Number 13 55 1 I .4.15 Pack Item Number 14 56 1 1.4.16 Pack Item Number I5 56 1 1.5 Sub code location 1 1.5.1 Sub code Pack Items on a Single Data Space tape 11.5.2 Sub code Pack Items on a partitioned tape 56 56 57 12 Method of recording 12.
20、1 Physical recording density 12.2 Long-term average bit cell length 12.3 Short-term average bit cell length 12.4 Rate of change 12.5 Bit shift 12.6 Read signal amplitude 12.7 Maximum recorded levels 13 Track geometry 13.1 Track configuration 13.2 Average track pitch 13.3 Variations of the track pitc
21、h 13.4 Track width 13.5 Track angle 13.6.Track edge linearity 13.7 Track length 13.8 Ideal tape centreline 13.9 Azimuth angles 14 Recorded patterns 59 14.1 Recorded Main Data Fragment 59 14.2 Preamble Zone, Margin Zones 59 15 Format of a track 59 15.1 Format of a track 59 15.2 Positioning accuracy 6
22、U 15.3 Tracking scheme 60 16 Layout of a Single Data Space tape 16.1 Device Area 16.2 Reference Area 16.3 Position Tolerance Band No. 1 16.4 System Area 16.4.1 System Preamble 57 57 57 57 57 57 57 57 58 58 58 58 58 59 59 59 59 59 60 61 61 61 61 61 ISO/IEC 15521:1998(E) OISO/IEC 16.4.2 System Log 16.
23、4.3 System Postamble 16.4.4 Position Tolerance Band NO. 2 16.4.5 Vendor Group Preamble 16.5 Data Area 16.5.1 Vendor Group 16.5.2 Recorded Data Group 16.5.3 ECC3 16.5.4 Repeated Frames 16.5.5 Appending and overwriting 16.6 EOD Area 16.7 Post-EOD Area 16.8 Early Warning Point - (EWP) 16.9 Initializati
24、on 17 Layout of a partitioned tape 17.1 Overall magnetic tape layout 17.1.1 Device Area 17.1.2 Partition 1 17.1.3 Partition 0 17.2 Area ID 17.3 System Area Pack Items No. 3 and No. 4 17.4 Empty partitions 17.4.1 Empty partition 1 17.4.2 Empty partition 0 17.5 Initialization of partitioned tapes 18 H
25、ousekeeping Frames 69 18.1 Amble Frames 69 18.2 System Log Frames 69 18.3 Tape Management Frames 69 Annexes A - Measurement of the light transmittance of the prisms B - Measurement of light transmittance of tape and leaders C - Measurement of Signal-to-Noise Ratio D - Method for determining the nomi
26、nal and the maximum allowable recorded levels E - Representation of 8-bit bytes by IO-bit patterns F - Measurement of bit shift G - Measurement of track edge linearity H - Recognition Holes J - Means to open the lid K - Recommendations for transportation L - Read-After-Write. M - Example of the cont
27、ent of a Basic Group No. 0. 62 62 62 62 62 62 62 62 63 63 65 65 66 66 66 67 67 67 68 68 68 68 69 69 69 72 74 77 78 79 91 93 94 95 97 98 99 vi OISO/IEC ISO/IEC 15521:1998(E) Foreword IS0 (the International Organization for Standardization) and IEC (the International Electrotechnical Commission) form
28、the specialized system for worldwide standardization. National Bodies that are members of IS0 or IEC participate in the development of International Standards through technical committees established by the respective organization to deal with particular fields of technical activity. IS0 and IEC tec
29、hnical committees collaborate in fields of mutual interest. Other international organizations, governmental and non-governmental, in liaison 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.
30、Draft International Standards adopted by the joint technical committee are circulated to national bodies for voting. Publication as an International Standard requires approval by at least 75 % of the national bodies casting a vote. International Standard ISO/IEC 1552 1 was prepared by JISC (as Stand
31、ard JIS X.6 130- 1996) with document support and contribution from ECMA and was adopted, under a special “fast-track procedure” by joint Technical Committee ISO/IEC JTC 1, Inforniation technology, in parallel with its approval by national bodies of IS0 and IEC. Annexes A, B, C, D, E, F and G form an
32、 integral part of this International Standard. Annexes H, J, K, L and M are for information only. vii INTERNATIONAL STANDARD OISO/IEC ISO/IEC 15521:1998(E) Information technology - 341 mm wide magnetic tape cartridge for information interchange - Helical scan recording - DDS-3 format using 125 m len
33、gth tapes 1 Scope This International Standard specifies the physical and magnetic characteristics of a 3,81 mm wide magnetic tape cartridge to enable physical interchangeability of such cartridges between drives. It also specifies the quality of the recorded signals, the recording method and the rec
34、orded format - called Digital Data Storage (DDS) - thereby allowing data interchange between drives by means of such magnetic tape cartridges. Information interchange between systems also requires, at a minimum, agreement between the interchange parties upon the interchange code(s) and the specifica
35、tions of the structure and labelling of the information on the interchanged cartridge. Under information interchange circumstances in which a processing algorithm, e.g. for lossless data compression as specified in ISOLEC 11558, is applied to the host data prior to recording on the tape and a comple
36、mentary reprocessing algorithm is applied after the data is read from the tape, agreement upon these by the interchange parties is also required. 2 Conformance 2.1 Magnetic tape cartridge A tape cartridge shall be in conformance with this International Standard if it meets all the mandatory requirem
37、ents specified herein. The tape requirements shall be satisfied throughout the extent of the tape. For each recorded Entity any algorithm for lossless data compression used for processin, 0 the data therein shall have been registered, and according to ISO/IEC 11576 the correspondin, 0 numerical iden
38、tifier shall be recorded in Byte No. 3 of the Entity Header. 2.2 Generating drive A drive generating a magnetic tape cartridge for interchange shall be in conformance with this International Standard if all recordings on the tape meet the mandatory requirements of this International Standard, and if
39、 either or both methods of appending and overwriting are implemented. A claim of conformance shall state which of the following optional features are implemented and which are not - the performing of a Read-After-Write check and the recording of any necessary repeated frames; - the generation of ECC
40、3 Frames. In addition a claim of conformance shall state - whether or not one, or more, registered algorithm(s) are implemented within the system and are able to process data received from the host prior to collecting the data into Basic Groups, and - the algorithm registration identification number
41、(s) of the implemented algorithm(s). 2.3 Receiving drive A drive receiving a magnetic tape cartridge for interchange shall be in conformance with this International Standard if it is able to handle any recording made on the tape according to this International Standard. In particular it shall - be a
42、ble to recognize repeated frames and to make available to the host, data and Separator Marks from only one of these frames; - be able to recognize an ECC3 frame, and ignore it if the system is not capable of using ECC3 check bytes in a process of error correction; - be able to recognize processed da
43、ta within an Entity, identify the algorithm used, and make the algorithm registration number available to the host; - be able to make processed data available to the host. In addition a claim of conformance shall state - whether or not the system is capable of using ECC3 check bytes in a process of
44、error correction; 1 ISO/IEC 15521:1998(E) OISO/IEC - whether or not one or more reprocessing algorithm(s) are implemented within the system, and are able to be applied to processed data prior to making such data available to the host; - the algorithm registration number(s) of the processing algorith
45、m(s) for which a complementary reprocessing algorithm is implemented. 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 indicated were valid. All stan
46、dards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of standards indicated below. Members of IEC and IS0 maintain registers of currently valid International Standards. IS0 527
47、 (all parts), Plastics - Determination of tensile properties, IS0 1302: 1992, Technical drawings - Method of indicating surf&e texture. ISO/IEC 11557: 1992, Information technology - 3,8/mm wide magnetic tape curtridge for information interchange - Helical scan recording - DDS-DC format using 60 m nn
48、d 90 m length tapes. ISO/IEC 11576: 1994, ISO/IEC 12247: 1993, ISO/IEC 13923: 1996, IEC 950: 199 1, IEC 1119-I: 1992, Information technology - Procedure for the registration of algorithms for the lossless compression of data. Information technology - 3,81mm wide magnetic tape cartridge for informati
49、on interchange - Helical stun recording - DDS format using 60 m and 90 m length tapes. Information technology - 3,8/ mm wide magnetic tape cartridge for information interchange - Helical scan recording - DDS-2 format using 120 m length tape. Safety of information technology equipment including electrical business equipmerlt. Digital audio tape cassette system (DAT) - Put I: Dimensions and characteristics. 4 Definitions For the purposes of this International Standard, the following definitions apply. 4.1 Absolute Frame Number (AFN): A sequence number, encoded in the Frame. 4.2 a.c. erase: A p
