1、ECMA ECMA*L70 92 E 3404593 0033930 057 El ECMA EUROPEAN COMPUTER MANUFACTURERS ASSOCIATION STANDARD ECMA-170 3,81 mm WIDE MAGNETIC TAPE CARTRIDGE FOR INFORMATION INTERCHANGE = HELICAL SCAN RECORDING - DDS FORMAT USING 60 m AND 90 m LENGTH TAPES June 1992 ECMA ECMA*170 92 3404593 0013931 T93 ECMA EUR
2、OPEAN COMPUTER MANUFACTURERS ASSOCIATION STANDARD ECMA-170 3,81 mm WIDE MAGNETIC TAPE CARTRIDGE FOR INFORMATION INTERCHANGE - HELICAL SCAN RECORDING - DDS FORMAT USING 60 m AND 90 m LENGTH TAPES June 1992 ECMA ECMAa170 92 3404593 0013932 92T = BRIEF HISTORY ECMA have roilucetl ;I series of E(:MA St;
3、ind;irds for cassettes and cartridges containing magnetic tapes of different width and characteristics. E:.(MA-34 (1976): E(.hlA-40 ( 1470): ECMA-79 (1985): ECMA-O8 (1485): ECMA- 120 ( 1987): ECMA- 13) ( 1040): ECMA-135 (1040): ECMA- I40 (I9YO): ECMA- 150 (lP)l ): ECMA- 152 ( I) 1): ECMA-I71 (1993):
4、 at;i 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) ht:i Intei-change on 6,30 mm Magnetic Tape Cartridge Using IMFM Recording at 253 ftpmm Data Interchange on 6,30 mm Magnetic Tape Cartridge Using N
5、RZI Recording at 344 ftpmm - Streaming Mode Data Interchange on 12,7 mm 18-Track Magnetic Tape Cartridges 3.81 rnm Wide Magnetic Tape Cartridge for Information Interchange - i-Ielical Scan Recording - DDS Format 8 niiii Wide Magnetic Tape Cartridge for Information Interchange - Helical Scan Record i
6、 ng 3,til miil Wide Magnetic Tape Cartridge for Information Interchange - Helical Scan Kecording - Data/Dat Format 3.8 I mni Wide Magnetic Tape Cartridge for Information Interchange - Helical Sc:iii Recording - DDS-DC Format liit;i Inierchange on 12.7 mm 18-Track Magnetic Tape Cartridges - Extended
7、Format 3,s 1 miil Wide Magnetic Tape Cartridge for Information Interchange - Helical Scan Recording - DatdDat-DC Format The first five niedia were designed for the digital recording of data for storage and processing in data processing systems. In recent years. other niagnetic media. originally deve
8、loped for audio and video applications have been considered for use in daCi pi-ocessing applications for storage as well as for information interchange. The recording method known ;is Iielical sc;tn recording. together with new types of magnetic tapes. allows to achieve capacities of more than I gig
9、ahyte of user data. Standard ECMA-I34 was the first of ;I series of ECMA Standards for such magnetic tape cartridges. Upon request of Committee ISOllEC JTCI/SCI 1 it has heen adopted as an International Standard under the fast-track procedure as ISOllEC 10777. This Standard ECMA-I70 is a further sta
10、ndard for the same reciirded format. but which supports two types of cartridges. For Type A. the magnetic tape has a nominal thickness of 13 prn. For Type R. the magnetic tripe has a nominal thickness of 9 pm. Also upon request of ISO/IEC JTCI/SCI I. St;iiidards ECMA-145. ECMA-116. ECMA- 150 ;ind EC
11、hlA-152 have heen contributed to ISOIEC JTC I and adopted. under the fast-track procedure. as Internntioiial Standards ISO/lEC 11319, ISO/IEC 11331. ISO/IEC 11557 and ISO/IEC 11559. respectively. Adopted ;IS :III 1CMA St;inciii.d hy the General Assembly of June 1992. ECMA ECMA*370 92 3404593 0033933
12、 866 - -I- Table of contents Section 1 - General 1 scope 2 Conormunce 2. I Magnetic tape cirtridge 2.2 Generiiting system 2.3 Rece v i ng syste m 3 Normative Reerences 4 Defin it ions 1.1 4.2 3.3 4.3 3.5 1.0 4.7 4.s 4.t) 4.IU 4.1 I 4.13 3.13 4. I4 1.15 4. Ih 4.17 4.1s 4. IO 4.20 1.2 1 4.31 4.23 4.21
13、 4.25 4.2h 4.21 3.28 4.29 4.30 Absolute Frame Number (AFN) Automatic Trick Finding (AT) Area ID Average Signal Amplitude Azimu t h Back surface Byte Cart ridge Channel hit D;iia Format II Early Warning Point (EWP) Error Correcting Code (ECC) Flux transit ion pixi tion Flux trmsition spacing Frame t-
14、lousekeeping Frame Logical Reginning of Tape (LBOT) Miignetic tipe Master Standird Aniplitude Calibration Tape Master Stand;ird Reference Tape Optimum Recording Field Partition hund;iry Physical Beginning of Tape (PBOT) Physical End of Tape (PEOT) Physical recording density Pre-recording condition R
15、ecord Reference Recording Field Secondary Standard Amplitude Calibration Tape EWI of rm (FOI) Page 1 1 1 1 1 1 3 “ 2 7 7 3 3 - - - - 2 2 2 2 2 2 3 3 3 3 3 3 3 3 3 3 3 3 4 3 3 4 4 1 4 4 ECMA ECMA*L70 92 U 3404593 0013934 7T2 4.31 Secondiiry Stiindard Reference Tap 4.32 Sepirator hlark 4.33 Standard R
16、eference Amplitude 4.34 Tape Reference Edge 4.35 Test Rccoidiiig Current 4.36 Track 4.37 Vii.iuiil 13iiil iif Ipe (VEOT) Environment and s;rletj 5. I Icsii iig cnvirun niciil 5.2 ( )11t!riitiiig environnieni 52 Sioiiigc eiiviiiinnieiii 5.4 Irn iispiri;iiion 5.5 Siifci); 5.0 llitniiililiiy 2 - Requir
17、emenis lor the case 6 Dimensional and mechanical cliaractcristics of the case 6 I). I 0.2 0.3 h.4 h.5 6.0 b.1 6.8 (riiccrl ( )vcrill dimensions (figkivch 1) iind 7) I .wiitig grip (figure o) I lolding areas (figure h) Noiches of the lid (figures 5 iiid 8) 1.iJ dimensions (figur h to H) Optical detec
18、tion of the Beginning and End of Tape (figura 9 and 2) Hoiiom side (figures 10 and 1 I) h.8. I 6.8.2 b.8.3 6.8.4 6.8.5 6.8.6 6.8.H 6.8.9 6.8. I I h.x.7 6.8. i o Locking mechanism of the slider 9 Access holes 10 Recognition, Sub-datums. and Write-inhihit Holes IO Datum Holes 12 Access room for tape g
19、uides 12 Holes for accessing the hubs 13 Internal structure of the lower half (figure 12) 13 Light path (figure 12) 14 Support Areas (figure 13) 14 Datum Areas (figure 1.7) 14 Relationship heiween Suppoiz and Datum Areas and Reference Plane 2 (figure 14) 15 6.9 Hulrs (figurei 15, 16) 6.10 Leaer and
20、tiiiilcr attachment 6.1 1 Interfart: lietween 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 19, 20) 6.14 Label arais (figitre 2 I, 22) 15 15 16 16 16 14 Section 3 - Requirements for the unrecorded tape 28 7 Mechanic
21、al, physical and dimensional characteristics of the tape 28 7. I 7.2 ?.3 7.4 7.5 . 7.0 7.7 7.8 7.Y 7.10 7.1 I 7.12 7.13 hlit t c. ria Is 1:ipe length 7.1. I 7.1.2 Tape width I kcon tinii i t ies To tal thick ness L.ongitudin* ,I I ciirviitue Cupping Coating adhesion Layer-to-layer :id hesion Tensile
22、 strength 7.10.1 reaking strength 7.10.2 Yield strength Residual elongation Electrical resistance of coated surfaces I-ight transmittance of the tape Length of magnetic lape Length of leader and trailer tapes 8 Magnetic recording characleristics 8. I Optimum Recording Field 8.2 Signal amplitude 8.3
23、Resol u tion 8.4 Overwrite 8.4. I 8.4.2 Physical recording densities of 750.6 ftprnm and 3002 ftpmm Physical recording densities of 83.4 ftpmrn and 1001 ftprnrn 8.5 Ense of erasure 8.6 Xtpe quality 8.6.1 Missing pulses K.h.3 Missing pulse zone 8.7 Signal-to-noise ratio (9N) characteristic :. Section
24、 4 - Requirements for an interchanged tape 9 Format 9.1 General 9.2 Basic Groups 9.2.1 Group information Table 9.2.2 lixk Access Table 28 28 28 28 28 28 38 28 28 29 30 30 30 30 30 31 31 32 32 37 32 33 33 33 33 33 33 33 34 34 34 34 35 38 0.3 Sub-Groups 40 ECMA ECMA*L70 9Z D 3Li04593 OOL393b 575 D - i
25、v - 10 11 12 13 9.3. I o 1 Sub-Group 0.32 G2 Sub-Group - Randomizing 9.3.3 (3 Suh-Group 9.3.1 ci4 Sub-Group 0.3.5 Main Dntii Black 9.4 Sub 1)at;i Area c)A. I 0.4.2 0.4.3 9.4.4 0.4.5 9.3.h 9.4.7 9.4.8 1.4.0 Pnch Item No. I Pack Item No. 2 Pack Item No. 3 Pack Item No. 3 Pack Item No. 5 kick Item No.
26、6 P;ich Item No. 7 P:ich Item No. 8 Sh Ditii Black Method of recording 10.1 Physical recording density 10.2 10.3 10.4 Rate of ch;inpe 10.5 Rit shift 10.6 Re;id signil amplitude 10.7 Miixiniiim recorded levels Long-term average bit cell length Short-term averiige hit cell length Track geometry 11.1 1
27、1.2 11.3 11.4 11.5 11.6 11.7 11.8 11.9 Track configiirrition Average track pitch Variations of the track pitch Track width Track angle Track edge lineiirity Track length Ideal tape centreline Azimuth iinples Recording a blocks on the lapc 12.1 Recorded Main Ibta Block 12.2 Recorded Suh Data Block 12
28、.3 12.4 Spacer Ijltwks MiIrgin Blocks, Preamhle Blocks and Postamble Blocks Format or u track 13.1 Track ciipiicity 13.2 Pos timing iici.iit*y 40 41 41 43 41 49 49 . 50 51 52 54 55 56 57 57 62 62 62 62 62 62 62 62 62 b2 63 63 63 63 64 b4 64 64 64 64 64 64 64 64 64 65 ECMA ECMA*37O 92 3404593 0033937
29、 403 14 15 16 -v- 13.3 Tracking scheme Layout o a Single Data Space tape 14.1 14.2 14.3 13.4 13.5 14.0 13.7 13.8 14.0 f.kvice Area Rcerence Aren Position Tolerance Band No. 1 System Area 14.3. I System Preamble 13.4.2 System Log 14.4.3 System Postamble 14.4.4 14.4.5 Vendor Group Preamble Daii Area 1
30、4.5.1 Vendor Group 14.5.2 Recorded Data Group 13.5.3 ECC.7 14.5.4 Multiple recorded instances 14.5.5 Repeated frames 14.5.6 Appending and overwriting EOD Area Post-EOD Area Early Warning Point - EWP Initi;ilization Position Tolerance Band No. 2 kiyout of a Partiiioned tape 15.1 Overall magnetic Lqpe
31、 layout 15.1.1 Device Aren 15.1.2 Partition 1 15.1.3 Partition 0 15.2 rZre;i in 15.3 15.4 Empty Pirtitioii 15.5 Initi;ilization of Partitioned Tapes System Area Piick Items No. 3 and NO. 4 Housekeeping frames Ih. I Amble Frames 1 h.2 System lag Frames 16.3 Tape Management Frames Annex A - Measuremen
32、t of the light transmittance of the prisms Annex B - Recognition Holes Annex C - Means to open the lid 65 68 68 69 69 69 69 69 69 69 69 h4) 70 70 70 71 71 72 73 74 74 74 74 75 75 75 76 77 77 77 77 77 78 78 78 79 81 83 ECMA ECMA*:5?0 92 M 3LiOY593 0033938 348 M - vi - Annis Type A and Type H. For Typ
33、e A. the magnetic tape has i nominal thickness of 13 pm and a nominal length of up to 60.5 m. For Type H, the magnetic tape has a nominiil thickness of 9 pm and a nominal length of up to 92.0 m. Inforination interchange between systems hy means of this Standard also requires the use, at a minimum, o
34、f i Ialrelliiig and file structure and an interchange code which are agreed upon hy the interchange parties. It is not within the scope 01 this Standard to specify the labelling and file structure, or the in terc hange code. Conformance Magnetic tape cartridge A IiiIW cirtridge sh;ill be in conforma
35、nce with this Standard if it meets all mandatory requirements specified hereiii foi. eithei- Typ A or Type B. The tape requirements shall be satisfied throughout the extent of the tap. A recorded t;ipc shall be either a Single Data Space Tape or a Partitioned Tape. Generating system A system generat
36、ing ;I magnetic tape cartridge for interchange shall be entitled to claim conformance with this Standird if all recordings on the tape meet the mandatory requirement; of this Standard. and if either or both niethods of appending ;ind overwriting are implemented. A claim of confurmance shall state wh
37、ether cartridges of Type A or Type B or both are supported. In addition i rliiin of conformance shall also state which of the following optional features are implemented and which are not: - - - Receiving system A system receiving ;i ni;igiietic tape cartridge for interchange shall be entitled to cl
38、aim conformance with this Standard if it is able to handle any recording made on the tape according to this Standard. In p:irticular it shall he able: - to recognize repeated frames and to make available to the user data and Separator Marks from only one of these frames. io recogiiizc multiple repre
39、sentations of the same Basic Group and to make available to the user driti ind Separ;itor h1;irks from only one of these representations, to iildiitc the System L.og(s) if the Write-inhibit Hole state so permits, tti recogiiize ;in l(C3 fixnie. iind ignore it if the system is not capable of using EC
40、C3 check bytes in a pr of error correction. the performiiig of ;I Read-After-Write check and the recording of any necessary repeated frames, the recording of inultiple represeiitations of the same Basic Group, the generation of E(C3 F;rames. - - - ECMA ECMA*1i70 92 = 3YOY593 OOL39YO TTb 9 -2- A clai
41、m of conformance shall state whether or not the system is capable of using ECC3 check bytes in a process of error correction. In addition a claim of conformance shall also state whether cartridges of Type A or Type 3 or both are supported. 3 Normative References ECMA- 129 ISO/R 527: 1966 IS0 1302: 1
42、978 Safety of Information Technology Equipment (SITE) (1988) Plastics - Determination of tensile properties. Technical Drawings - Method of indicating surface texture on drawings. 4 Definitions For the purpose of this Standard, the following definitions apply. 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 4.1
43、0 Absolute Frame Number (Am) A sequence number, encoded in the frame. 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 Signal Amplitude The average peak-to-peak value of the
44、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. 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
45、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 after 8-10 transformation. D
46、ata Format ID An identifier specifying which data format is being used on the tape. 4.1 1 4.12 4.13 4.14 4.15 4.16 4.17 4.18 4.19 4.20 4.21 4.22 ECMA ECMAU370 32 3404533 0033343 332 -3- Early Warning Point (EWP) A point along the length of the tape at which warning is given of the approach, in the f
47、orward 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. Error Correcting Code (ECC) A mathematical algorithm yielding check bytes used for the detection and correctio
48、n 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 transitions. Frame A pair of adjacent tracks with azimuths of opposite polarity, in which the track w
49、ith the positive azimuth precedes that with the negative 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 accept and retain the magnetic signals intended for input, output and storage purposes on computers and associated equipment. Master Standard Amplitude Calibration Tap
