1、ECMA ECMAaLSO 92 W 3404.593 0033737 b4T = ECMA EUROPEAN COMPUTER MANUFACTURERS ASSOCIATION STANDARD ECMA-150 3,81 mm WIDE MAGNETIC TAPE CARTRIDGE FOR INFORMATION INTERCHANGE - HELICAL SCAN RECORDING - DDS-DC FORMAT USING 60m AND 90m LENGTH TAPES 2nd Edition -June 1992 ECMA ECMA*35O 92 3404593 003373
2、8 586 W ECMA EUROPEAN COMPUTER MANUFACTURERS ASSOCIATION STANDARD ECMA=l50 3,81 mm WIDE MAGNETIC TAPE CARTRIDGE FOR INFORMATION INTERCHANGE = HELICAL SCAN RECORDING - DDS-DC FORMAT USING 60 m AND 90 m LENGTH TAPES 2nd Edition -June 1992 ECHA ECNA*lSO 92 m 3404593 0033739 432 m BRIEF HISTORY ECMA h;i
3、c Ii-iltliicctl ;I seiies OC ECMA Siiindards for cassettes and cartridges containing magnetic tapes of different Widill illld ct1;ir;icteristics. lc Miister Siandard Amplitude Calibration Tape Miislei- Standaid Reference Tape Optimum Recoixling Field Physical Beginning of Tape (PBOT) fhysicol End of
4、 T;ipc. (PEOT) fhysic;iI Kecording Density Pre-recording Condition Ryle Partition oui1dar)- Page 1 1 1 1 1 2 2 2 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 1 4 4 4 4 1 4 4 4 4 4 4 5 5 5 5 4.34 4.35 4.30 4.37 4.38 4.39 4.40 4.4 1 4.43 1.43 4.44 4.45 4.40 4.47 4.4s Processed Record Processed Record SC11 u ence nec
5、t) 1-d Rcerrnce Rectirtiiiig Field Reprocess iig Secondary Stiindard Amplitude S lJ.7.1 0.2.3 92.3 lach Access Tible (BAT) I :i11 i t y Giuiip In format ion T;i ble su Il-G IOlI 13s 11.3. I G I Siih-Group 9.3.3 Ci2 Sub-Group - Randomizing 0.3.3 G3 Sub-Group 11.3.5 Main thta Block Suli-D;it;i Aren 9.
6、4. I P;ick Item No. I 0.4.2 Pich Iteiii No. 2 9.4.3 I“A Item No. 3 ).4.4 I1;ich Item No. 4 0.4.5 P;ich Item No. 5 ).4.tl Pach Item No. Ii 11.4.7 P;ick Item No. 7 0.4.s Pack Item No. 8 0.4.Y Sub Dati liick 0.3.4 Ci4 Sb-Giop 10 Method ol recarding IO. I Physical Recording Iknsiiy 10.2 10.3 10.4 Iliite
7、 of Change 10.5 Rit Shift I0.h Re;id Signal Amplitude 10.7 Miiximiini Recorded Levels I .imp-Term Average Bit Cell 1 xngth Slioii-Term Aveiiige Rit Cell Length 11 Track geometry 11.1 11.2 11.3 11.4 11.5 11.6 11.7 11.8 11.9 Trach Configuriliuii Vari;iiiins of the track pitch iiich Width lrack Angle l
8、rack Edge liiieiirity Triich Length Azimiith Angles Averiipc Triich Pitch Iilcil Tiie Ceiitdiie 35 35 35 36 36 38 41 44 44 45 45 47 51 53 53 51 55 56 57 55 5Y 60 60 64 65 65 65 65 65 hj h5 65 65 66 66 66 67 67 67 67 67 12 13 14 1s ECMA ECMA*15O 92 3404593 0013744 BBT = -v- Recording of blocks on the
9、 tape 12.1 Recorded Main Data Block 12.3 Recorded Sub Ihta lock 13.3 12.4 Spacer Blocks Margin Blocks. Preainble Blocks and Postamble Blocks Format of a track 13.1 Track Capacity 13.2 Positioning Accurecy 13.3 7r;icl.i iig Scheme Layout of a Single Data Space tape 14.1 Device Aw;i 14.2 Reference Are
10、a 14.3 Position Tolerance Band No. I 14.4 System Aren 14.4.1 System Piwmble 14.4.3 System l.og 14.4.3 14.4.4 11.4.5 Vendor Group Preamble System Postam h i e Position Tolerance Band No. 2 14.5. I Vendor Group 11.52 Recorded thta Group 14.5.3 ECC3 14.5.4 Mu i ti ple Recoi-ded 1 nstances 14.5.5 Repeat
11、ed Frames I4.5.h Appending and Overwriting 14.h tlOI) Area 14.7 Ptsi-EOD Aii 14.8 13.0 Initia1ir;ition Early W;irning Point - EWP Layout of a Partitioned Tape 15.1 Overnll Magnetic 1;ipe Liyout 15.1.1 Device Area 15.1.3 P;irtiiion I 15. I .3 I;irtition 0 15.2 Aitiii II) 15.3 15.1 Empty Piriitions 15
12、.5 Initi;iliziitiim of Iirtitioned Tapes System Area Pack Items No. 3 and NO. 4 67 67 67 67 67 68 68 68 68 71 71 72 72 72 72 72 73 72 72 73 73 73 73 74 74 75 77 77 77 77 78 78 79 79 80 80 80 80 80 ECMA ECMA*550 92 M 3404593 O053745 75b = - vi - Section 5 Annexes Annex A - Measurement o the light tra
13、nsmitlance of the prisms Annex 15 - Hecognition holes Annex C - Means to open the lid Annex, I) - Measurement ol light transmittance otape and leaders Annex E - Measurement ul Signal-tu-Nuise Ratio Annex F - Method fur determining tire numinal and the maximum allowable recorded levels Annex C - Repr
14、esentation or 8-hii bytes by 10-bit patterns Annex H - Measurement o hit sliit Annex J - Recommendations fur transportation Annex K - Method of measuring track edge linearity Annex L - Read-After-Write Annex hl - Examplr ol the content of a Basic Croup No. O Annex N - Registration o Algorithms 81 81
15、 SI 81 83 85 87 89 91 95 97 99 1 O5 1 o9 111 113 115 117 ECMA ECHA*ie either II Single Data Space Tape or a Partitioned Tape. -.- 77 Generating System A system generating ;I niagnetic tape cartridge for interchange shall be entitled to claim confor- mance with this St:iiid;ird if all recordings on t
16、he tape meet the mandatory requirements of this Standard, and if either or both methods of appending and overwriting are implemented. In particular it shall he ahle to record unprocessed data, and processed data within entities. A claim of conformance shall state which of the following optional feat
17、ures are implemented and which are not: - the performing of a Read-Afiei-Write check and the recording of any necessary repeated frames; the recording of multiple representations of the same Basic Group; - ECMA ECMA*iim a conformance shall state: i) the generation of GK.3 Frames. whether or niit one
18、, or more. registered Algorithm(s) are implemented within the systein rind iiie ible to process data received from the host prior to collecting the dntii iiitil I3iiSic Ciiiup. and thc Algiirithm registration ideniilication numberis) of the implemented Algorithm(s); whether Type A ciirtridgetts or T
19、ype cartridges or both are supported. i i) iii) 2.3 Rece in8 System A systciii receiving n niiignetic tqie cartridge lai. interchange shall be entitled to claim full conforni;iiice with this Standiid if it ib iililc to handle any recording made on the tape iiccording to this Si;iiici;ird. In iitrtcl
20、Il:ir it sliiill: lie ;ililc to recognize rcpc;iietl friimcs and tii inake available to the host. data and Scp:ir;itor Marks from only one of these frames; Iic iihlc ta recognize multiple representations of the same Basic Group. and to mak iivail;iIile to the host, dtii and Separator Marks fium only
21、 one of these representations; le ;ililc to recognize nn E(*(.? fr:inic. and ignore it if the system is not capable of using EC(3 check bytes in n process of error correction: lie ;ililc to update the System Log(s) if the Write-inhibit Hole state so perniits; lie able 10 recognize processed d;iin wi
22、thin an entity. identify the Algorithm used. and make the Algorithni registration iiumhcr availahlc to the host; lie iiIi1c 10 make procesied dati? fivailahle 10 the host. i) i) iii) i) VI vi) Iii iiililitioii ii cliiini of coiilormiiiice sliiill Stiite: - Nhcihcr or not the systcni is c;ipahle of u
23、sing ECC3 check hytes in a process of error correct ion ; whether tir not one or more Reprocessing Algorithm(s) are implemented within the system, aiid are ;ihk to he applied to Processed Data prior to making such data available to the host; - the Algorithni registration numher(s) of the Prtlcming A
24、lgorithm(s) for which a coni 11 le men ta r y Rep riicessi ng Al go ri t h m is i m ple men ted, a nd whether *lbp .-i c;iriridges or Type cartridges or both are supported. - - 3 Rcferences t XM A- 1 30 liMA- I.?) S;ifety ti Inhrni;ilion Technology Equipinen1 (SITE) ( 1988) 3.8 I miil Wide M;ignetic
25、 Tape Cartridge for Information Interchange - Helical Sc;iii Kecordiiig - DDS Format (1990) Technical Di-awings - Method of indicating Surface Texture on Drawings Plastics - Determination of tensile properties Iiifiwmation technology - Procedure for the registration of algorithms for the lossless co
26、mpression of dala fin prcparuiionl IS0 1302:1Y78 ISO/R 527: IOhh ISO/IEC I157h il Definit ions For the piirlmse of this Standaril, the following definitions apply. ECHA ECHA*15O 92 W 3404593 0013748 425 = -3- 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 Absolute Frame Number (A
27、FN) A sequence number, encoded in the frame. Access Point A point, at the start of a Processed Record Sequence, at which the presentation of Codewords to a Reprocessing Algorithm is required to start, regardless of whether the data of interest in a retrieval operation starts at that point or at a su
28、bsequent point. Algorithm A set of rules for transforming the logical representation of data. Automatic Track Finding (ATF) The method by which tracking is achieved. Area ID An identifier defining the area of the tape and specifying the types of frame written. Average Signai Amplitude The average pe
29、ak-to-peak value of the output signal from the read head at the fundamental frequency of the specified physical recording density over a minimum of 7,8 mm of track, exclu- sive of missing pulses. Azimuth The angular deviation, in degrees, minutes and seconds of arc, made by the mean flux transition
30、line with the line normal to the centreline of the recorded 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 af
31、ter 8-10 transformation. Codeword A word which is generated by a Processing Algorithm. The number of bits in a Codeword is variable, and is not defined by this Standard. Data Format ID An identifier specifying which data format is being used on the tape. Early Warning Point (EWP) A point along the l
32、ength of the tape at which warning is given of the approach, in the forward direction of tape motion, of the partition boundary or of the Physical End of Tape. End of Data (EOD) The point on the tape at the end of the group which contains the last user data. 4.16 4.17 4.18 4.19 4.20 4.21 4.22 4.23 4
33、.24 4.25 4.26 437 -4- Entity A unit of recorded data, comprising a Processed Record Sequence preceded by housekeeping information. Error Correcting Code (ECC) A mathematical computation yielding check bytes used for the detection and correction of errors. Flux Transition Position That point which ex
34、hibits maximum free-space flux density normal to the tape surface. Flux Transition Spacing The distance along a track between successive flux transitions. Frame A pair of adjacent tracks with azimuths of opposite polarity, in which the track with the positive azimuth precedes that with the negative
35、azimuth. Housekeeping Frame A frame which contains no user data and which is identified as such by the values in the data fields therein. Logical Beginning of Tape (LBOT) The point along the length of the tape where a recording of data for interchange commences. Magnetic Tape A tape which will accep
36、t and retain the magnetic signals intended for input, output and storage purposes on computers and associated equipment. Master Standard Amplitude Calibration Tape A pre-recorded tape on which the standard signal amplitudes have been recorded in the tracks of positive azimuth, 23,O pm wide, at nomin
37、al track pitch, on an AC-erased tape. NOTE I The rape includes recordings made ar 83.4 fipmm, 333,6 ftpmm, 500,4 fipmm. IO01 ftpmm and 1501 ftpmm. NOTE 2 The Master Standard Amplilude Calibration Tape has been established by Sony Corporation. Master Standard Reference Tape A tape selected as the sta
38、ndard for Reference Recording Field, Signal Amplitude, Resolution, Overwrite and Signal-to-Noise Ratio. NOTE 3 The Master Siandard Reference Tape has been esrnblished by Sony Corporation. Optimum Recording Field In the plot of Average Signal Amplitude against the recording field at the physical reco
39、rding density of 3002 ftpmm, the field that causes the maximum Average Signal Amplitude. Partition Boundary The point along the length of a magnetic rape at which Partition 1 ends and Partition O commences. 4.28 4.29 4.30 4.31 4.32 4.33 4.34 4.35 4.36 4.37 4.38 4.39 4.40 -_ ECMA ECMA*LSO 92 m 340459
40、3 0033750 083 -5- Physical Beginning of Tape (PBOT) The point where the leader tape is joined to the magnetic tape. Physical End of Tape (PEOT) The point where the trailer tape is joined to the magnetic tape. Physical Recording -Density The number of recorded flux transitions per unit length of trac
41、k, expressed in flux transitions per millimetre (ftpmm). Pre-recording Condition The recording levels above which a tape intended for interchange shall not previously have been recorded. Processing The use of an Algorithm to transform host data into Codewords. Processed Data A sequence of Codewords
42、which results from the application of Processing to data. Processed Record A sequence of Codewords which results from the application of Processing to an Unprocessed Record. Processed Record Sequence A sequence of one or more Processed Records which starts on an 8-bit boundary and ends on a subseque
43、nt 8-bit boundary. Record Related data treated as a unit of information. Reference Recording Field The Optimum Recording Field of the Master Standard Reference Tape. Reprocessing The use of an Algorithm to transform Codewords into data as required by the host. Secondary Standard Amplitude Calibratio
44、n Tape A tape pre-recorded as defined for the Master Standard Amplitude Calibration Tape; the outputs are known and stated in relation to those of the Master Standard Amplitude Calibration Tape. NOTE 4 Secondary Standard Amplitude Calibration Tapes can be ordered from Sony Corporation, Audio Device
45、Business Department, Componen1 Marketing Group, 4-1 0-1 8, Takana wa, Minato-ku, Tokyo 108, Japan, under Par1 Number “Y-7000G until the year 2000. It i$ intended that these be used for calibrating tertiary reference tapes for use in routine calibration. Secondary Standard Reference Tape A tape the p
46、erformance of which is known and stated in relation to that of the Master Standard Reference Tape. 4.41 4.42 4.43 4.44 4.45 4.46 4.47 4.48 5 5.1 53 ECMA ECflA*i15 72 34OY593 OOi13753i TIT W -6- NOTE 5 Secondary Slandard Reference Tapes can be ordered porn Sony Corporation, Major Customer Division, M
47、agnetic Producrs Group, 6-7-35, Kitashnagawa, Shinagawa-ku, Tokyo 141, Japan, under Part Number RSD 1079 until the year 2000. It is intended that these be used for calibrating tertiary reference rapes for use in routine calibration. Separator Mark A record containing no user data, which is used to s
48、eparate data. Standard Reference Amplitude The Average Signal Amplitude from the tracks of positive azimuth of the Master Standard Amplitude Calibration Tape at a specified physical recording density. Tape Reference Edge The bottom edge of the tape when viewing the recording side of the tape, with t
49、he PEOT to the observers right. Test Recording Current The current that produces the Reference Recording Field. Track A diagonally positioned area on the tape along which a seria of magnetic signals may be recorded. Unprocessed Data Data which has not been subjected to Processing. Unprocessed Record A Record of Unprocessed Data, comprising an integral number of bytes. Virtual End of Tape (VEOT) The point along the length of the magnetic tape within Partition 1 which defines the end of the part of Partition 1 whi
