1、- - ECMA ECMA*L73 92 3404593 0033036 337 - ECMA EUROPEAN COMPUTER MANUFACTURERS ASSOCIATION STANDARD ECMA-171 3,81 rnm WIDE MAGNETIC TAPE CARTRIDGE FOR INFORMATION INTERCHANGE - HELICAL SCAN RECORDING = DATMDAT-DC FORMAT USING 60m AND 90m LENGTH TAPES June 1992 iECMA ECMA*171 92 U 3404593 O013037 27
2、3 ECMA ECMA*L7L 92 3404593 0033038 LOT ECMA EUROPEAN COMPUTER MANUFACTURERS ASSOCIATION STANDARD ECMA-171 3,81 mm WIDE MAGNETIC TAPE CARTRIDGE FOR INFORMATION INTERCHANGE = HELICAL SCAN RECORDING - DATAIDAT-DC FORMAT USING 60 m AND 90 m LENGTH TAPES June 1992 ECMA ECMA*373 92 W 3404593 0033037 O46 W
3、 Brief history ECMA have produced a series of ECMA Standards for cassettes and cartridges containing magnetic tapes of different width and characteristics. ECMA-33 (1 976): ECMA-46 (1 976): ECMA-79 (1985): ECMA-98 (I 985): ECMA-120 (1987): ECMA- 139 (1 990): ECMA-145 (1990): ECMA- I46 (1990): ECM A-
4、 l 50 (1 99 l): ECMA-152 (1991): ECMA- 170 (1 992): Data Interchange on 3,81 mm Magnetic Tape Cassette (32 bpmm. Phase Encoded) Data Interchange on 6,30 mm Magnetic Tape Cartridge (63 bpmm. Phase Encoded) Data Intei-change on 6,30 mm Magnetic Tape Cartridge Using IMFM Recording at 252 ftpmm Data Int
5、erchange on 6,30 mm Magnetic Tape Cartridge Using NRZI Recording at 394 ftpmm - Streaming Mode Data Interchange on 12.7 mm 18-Track Magnetic Tape Cartridges 3,81 mm Wide Magnetic Tape Cartridge for Information Interchange - Helical Scan Recording - DDS Format X mm Wide Magnetic Tape Cartridge for In
6、formation Interchange - Helical Scan Recording 3,81 mm Wide Magnetic Tape Cartridge for Information Interchange - Helical Scan Recording - Data/Dat Format 3.81 mm Wide Magnetic Tape Cartridge for information Interchange - Helical Scan Recording - DDS-DC Format Data. Interchange on 12.7 mm 18-Track M
7、agnetic Tape Cartridges - Extended Format 3,81 mm Wide Magnetic Tape Cartridge for Information Interchange - Helical Scan Recording - DDS Format - Using 60 m and 90 m Length Tapes The first five of these media were designed for the digital recording of data for storage and processing in data process
8、ing systems. In recent years, other magnetic media, originally developed for audio and video applications have been considered for use in data processing applications for storage as well as for information interchange. The recording method known as helical scan recording. together with new types of
9、magnetic opes. allows to achieve capacities of more than I gigabyte of user data. Standard ECMA-139 was the first of a series of ECMA Standards for such magnetic tape cartridges. Upon request of Committee ISO/IEC JTCI/SCll it has been adopted as an International Standard under the fast-track procedu
10、re as ISO/IEC 10777. This Standard ECMA-171 is a further standard for the same medium, however specifying two different lengths of tape. Also upon request of ISO/IEC JTCI/SCI I, Standards ECMA-145, ECMA-146, ECMA- 150 and ECMA- 152 have heen contriliuted to ISO/IEC JTCI and adopted under the fast-tr
11、ack procedure, as International Standard ISO/IE: I1310, IS0/1EC 11321, IS0/1EC 11557 and ISO/IEC 11559 respectively. Adopted ;IS ;in li(h1A St;iiid;irtl hy the Geiier;iI Assembly of June 1992. ECMA ECMA*171 92 3404593 0013040 868 m Table of Contents Page Section 1 - General 1 scope 2 Conformance 2.1
12、 Magnetic tape cartridge 2.2 Generating system 2.3 Receiving system 3 References 4 Definitions 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 4.10 4.1 1 4.12 4.13 4.14 4.15 4.16 4.17 4.18 4.19 4.20 4.21 4.23 4.24 4.25 4.26 4.27 4.28 4.29 4.30 4.31 4.32 - 4.22 Absolute Frame Number (AFN) Algorithm Area ID Autom
13、atic Track Finding (ATF) Average Signal Amplitude Azimuth Back surface Byte Cartridge Channel bit Codeword Data Format ID End of Data (EOD) End of Information (EOI) End of Partition (EOP) Entity Error Correcting Code (ECC) flux transition position Flux transition spacing Frame Group Logical Beginnin
14、g of Tape (LBOT) Logical End of Tape (LEOT) Magnetic tape Master reference Master Standard Amplitude Calibration Tape Master Standard Reference Tape Optimum recording field Partition Partition reference Physical Beginning of Tape (PBOT) Physical End of Tape (PEOT) 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 2
15、 2 2 2 2 2 2 3 3 3 3 3 3 3 3 3 3 3 3 4 4.33 4.34 4.35 4.36 4.37 4.38 4.39 4.40 4.41 4.42 4.43 4.44 4.45 4.46 ECMA ECMA*573, 92 M 3404593 0053043, 7T4 H Physical recording density Pre-recording condition (maximum recorded levels) Processed Record Processed Record Sequence Processing Record Reference
16、Recording Field Secondary Standard Amplitude Calibration Tape Secondary Standard Reference Tape Separator Standard Reference Amplitude Tape noise amplitude Tape Reference Edge Track 5 Environment and safety 5.1 Testing environment 5.2 Operating environment 5.3 Storage environment 5.4 Transportation
17、5.5 Safety 5.6 Flammability Section 2 - Requirements for the case 6 Dimensional and mechanical characteristics of the case 6.1 6.2 6.3 6.4 6.5 6.6 6.7 6.8 General Overall dimensions (figures 6 and 7) Loading grip (figure 6) Holding areas (figure 6) Notches of the lid (figures 5 and 8) Lid dimensions
18、 (figures 6 to 8) Optical detection of the beginning and end of tape (figures 9 and 12) Bottom side (figures 10 and 11) 6.8.1 6.8.2 6.8.3 6.8.4 6.8.5 6.8.6 6.8.7 6.8.8 6.8.9 Locking mechanism of the slider Access holes Recognition, sub-datum and write-inhibit holes Datum holes Access room for tape g
19、uides Holes for accessing the hubs Internal structure of the lower half (figure 12) Light path (figure 12) Support areas (figure 13) 6.8.1 O Datum areas (figure 13) 4 4 4 4 4 4 4 4 4 4 4 5 5 5 5 6 6 6 6 7 7 7 7 8 9 9 10 10 11 12 12 12 13 14 14 6.8.1 1 Relationship bekeen support and Datum Areas and
20、Reference Plane 2 (figure 14) 14 6.9 Hubs (figures 15, 16) 6.10 Leader and trailer attachment 6.11 Interface between the hubs and the drive spindles (figure 17) 6.12 Opening of the lid (figure 18) 6.13 Release of the hub locking mechanism (figures 13, 20) 6.14 Label area (figures 21, 22) Section 3 -
21、 Requirements for the unrecorded tape 7 Mechanical, physical and dimensional characteristics of tlw. tape 7.1 7.2 7.3 7.4 7.5 7.6 7.7 7.8 7.9 7.10 7.1 1 7.12 7.13 Materials Tape length 7.2.1 Length of magnetic tape 7.2.2 Tape width Discontinuities Total thickness Longitudinal curvature Cupping Coati
22、ng adhesion Layer-to-layer adhesion Tensile Strength 7.10.1 Breaking Strength 7.10.2 Yield Strength Residual elongation Electrical resistance of coated surfaces Light transmittance of tape Length of leader and trailer tapes 8 Magnetic recording characteristics 8.1 Optimum recording field 8.2 Signal
23、Amplitude 8.3 Resolution 8.4 Overwrite 8.4.1 8.4.2 8.5 Ease of erasure 8.6 Tape quality Physical Recording Densities of 750.6 and 3002 ftpmm Physical recording densities of 83,4 ftpmm and 1001 ftpmm 8.6.1 Missing pulses 8.6.2 Missing pulse zone 8.7 Signal-to-noise ratio (SN) characteristic 14 15 15
24、15 16 16 27 27 27 27 27 27 27 27 27 27 27 28 28 29 29 29 29 29 30 30 31 31 31 32 32 32 32 32 32 33 33 ECMA ECMA*1171i 92 3404593 00113043 577 - iv - Section 4 - Format 9 DATADAT format 9.1 General 9.2 Basic Groups 9.2.1 9.2.2 Basic Groups for Group Format O Basic Groups for Group Format 1 9.3 Sub-Gr
25、oups 9.3.1 G1 Sub-group 9.3.2 G2 Sub-group 9.3.3 G3 Sub-group 9.3.4 G4 Sub-group 9.3.5 Main Data Block 9.4 Sub-Data area 9.4.1 Pack Itern No. 1 9.4.2 Pack Item No. 2 9.4.3 Pack Item No. 3 9.4.4 Pack Item No. 4 9.4.5 Pack Item No. 5 9.4.6 Pack Item No. 6 9.4.7 Pack Item No. 7 9.4.8 Sub Data Block 9.5
26、 Basic Group structure 9.5.1 User Data 9.5.2 System Data 9.5.3 Record ID list 9.5.4 Heuristic Recovery Data Area 10 Method of recording 10.1 Physical recording density 10.2 10.3 10.4 Rate of change 10.5 Bit shift 10.6 Read signal amplitude 10.7 Maximum recorded levels Long-Term average bit cell leng
27、th Short-Term average bit cell length 11 Track geometry 11.1 Track configuration 11.2 Average track pitch 11.3 11.4 Track wid th 11.5 Track angle 11.6 Track edge linearity Variations of the track pitch 33 33 33 33 34 35 36 36 37 37 38 43 - 45 45 46 48 49 50 51 52 52 54 55 56 60 65 65 65 65 65 65 65
28、66 66 66 66 67 67 67 67 67 12 13 14 15 ECMA ECMA*171 92 3404593 0013044 403 -v- 11.7 Track length 11.8 Ideal tape centreline 11.9 Azimuth angles Recording of blocks on the tape 12.1 Recorded Main Data Block 12.2 Recorded Sub Data Block 12.3 12.4 Spacer Blocks Margin Blocks, Preamble Blocks and Posta
29、mble Blocks Format of a track 13.1 Track capacity 13.2 Positioning accuracy 13.3 Tracking scheme Group Formats 14.1 Group Format O 14.2 Group Format 1 14.3 Extended Gap Frames 14.3.1 Extended Leading Gap Frames 14.3.2 Extended Trailing Gap Frames 14.4 Types of Groups 14.4.1 Normal Groups 14.4.2 Spar
30、e Groups 14.4.3 Amble Groups Magnetic tape layout 15.1 15.2 15.3 15.4 15.5 LoadllJnload Area Lead-in Area 15.2.1 Preamble 15.2.2 Header 15.2.3 Format Parameter Set 15.2.4 Master Reference 15.2.5 Postamble Partition 15.3.1 Partition Preamble 15.3.2 Partition Reference 15.3.3 Partition Postamble 15.3.
31、4 Partition Data 15.3.5 End of Partition (EOP) 15.3.6 Unused Area EO1 Repeated Groups 67 67 67 67 67 68 68 68 68 68 69 69 71 71 71 72 72 72 73 73 73 73 74 74 75 75 75 77 82 88 89 89 89 101 101 102 102 102 103 -vi- 15.6 15.7 Relocation of Defective Groups 15.8 Appending Repeated Frames within a Norma
32、l Group 15.8.1 Seamless appending 15.8.2 Non-seamless appending 15.9 Overwrite (figure 77) 15.9.1 Overlapped track width 15.9.2 Non-overlapped track width 15.9.3 Rules for overwrite Annex A - Measurement of the light transmittance of the prisms Annex B - Recognition Holes Annex C - Means for opening
33、 the lid Annex D - Measurement of light transmittance of tape and leaders Annex E - Measurement of Signal-to-Noise Ratio Annex F - Method for determining the nominal and the maximum allowable recorded levels Annex G - Representation of 8-bit bytes by 10-bit pattern Annex H - Measurement of bit shift
34、 Annex J - Recommendations for transportation Annex K - Method of measuring track edge linearity Annex L - Read-After-Write Annex M - Data allocation and C3 parity Annex N - Registration of Algorithms 103 103 104 104 106 107 108 108 108 1 o9 111 113 115 119 121 123 129 133 135 137 139 143 ECMA ECMA*
35、171 92 9 3404593 0013046 286 -1- Section 1 - General 1 2 2.1 2.2 2.3 3 4 4.1 4.2 4.3 %ope This ECMA Standard specifies the physical and magnetic characteristics of a 3.81 mm wide magnetic tape cartridge to enable interchangeability of such cartridges. It also specifies the quality of the recorded si
36、gnals, the recorded format and the recording method, thereby allowing data interchange between drives by means of such magnetic tape cartridges. This ECMA Standard specifies two types of cartridges which, for the purpose of this ECMA Standard, are referred to as Type A and Type B. For Type A, the ma
37、gnetic tape has a nominal thickness of 13 pm and a nominal length of up to 60,5 m. For Type B, the magnetic tape has a nominal thickness of 9 pm a length of up to 92 m. Conformance Magnetic tape cartridge A tape cartridge shall be in conformance with this Standard if it meets all mandatory requireme
38、nts specified herein for either Type A or Type B. The tape requirements shall be satisfied throughout the extent of the tape. Generating system A system generating a magnetic tape cartridge for interchange shall be entitled to claim conformance to this Standard if all recordings on the tape meet the
39、 mandatory requirements of this Standard. A claim of conformance shall state whether cartridges of Type A or Type B or both are supported. Receiving system A system receiving a magnetic tape cartridge for interchange shall be entitled to claim conformance with this Standard if it is able to handle a
40、ny recording made on the tape according to this Standard. A claim of conformance shall.state whether cartridges of Type A or Type B or both are supported. References ECMA-6 ECMA-129 IS0 1302: 1978 ISO/R 527:1966 ISOAEC 11576: Information technology - Procedure for the registration of algorithms for
41、the 7-Bit Coded Character Set, 6th Edition (1991) Safety of Information Technology Equipment (SITE) (1988) Technical drawings - Method of indicating surface texture on drawings Plastics - Determination of tensile properties lossless compression of data (in preparation) Definitions For the purpose of
42、 this Standard, the following definitions apply. Absolute Frame Number (AFN) A sequence number allocated to, and recorded in, each frame. Algorithm A set of rules for transforming the logical representation of data. Area ID An identifier for each area of the tape specifying the types of frame writte
43、n therein. ECMA ECflA*i(L7l1 92 311011593 00530117 112 4.4 4.5 4.6 4.7 4.8 4.9 4.10 4.11 4.12 4.13 4.14 4.15 4.16 4.17. 4.18 4.19 -2- Automatic Track Finding (ATF) A method by which tracking is achieved. Average Signal Amplitude The average peak-to-peak value of the output signal from the read head
44、at the fundamental frequency of the specified physical recording density, over a minimum of 7,8 mm of track, exclusive of missing pulses. Azimuth The angular deviation, in degrees, minutes and seconds of arc, made by the mean flux transition line with the line normal to the centreline of the recorde
45、d track. Back surface The surface of the tape opposite to the magnetic coating which is used to record data. Byte An ordered set of bits acted upon as a unit. Cartridge A case containing magnetic tape stored on twin hubs. Channel bit A bit after 8-to-10 transformation. Codeword A word which is gener
46、ated by a Processing Algorithm. The number of bits in a Codeword is variable, and is not specified in this Standard. Data Format ID An identifier specifying which data format is being used on the tape. End of Data (EOD) The point where the host stopped writing data on the tape. End of Information (E
47、OI) A group which indicates the end of partition area in a tape. End of Partition (EOP) A group which indicates the end of data area in a partition. Entity A unit of recorded data, comprising a processed record sequence resulting from the application of a common processing algorithm. Error Correctin
48、g Code (ECC) A mathematical algorithm yielding check bytes used for the detection and correction of errors. Flux transition position That point which exhibits maximum free-space flux density normal to the tape surface. Flux transition spacing The distance along a track between successive flux transi
49、tions. ECMA ECMA*iIiL 92 m 3404593 001304B 057 = 4.20 4.21 4.22 4.23 4.24 4.25 4.26 4.27 4.28 4.29 4.30 4.31 -3- Frame A pair of adjacent tracks with azimuth of opposite polarity, in which the track with the positive azimuth precedes that with the negative azimuth. Group A number of frames constituting a recorded unit. Logical Beginning of Tape the outputs of which are known and stated in relation to that of the Master Standard Amplitude Calibration Tape. NOTE 4 The Secondary Standard Amplitude Calibration Tape can be ordered from the Sony Corporation, Audio Device Business Depart
