1、Standard ECMA-2102nd Edition - December 1995Standardizing Information and Communication SystemsPhone: +41 22 849.60.00 - Fax: +41 22 849.60.01 - URL: http:/www.ecma.ch - Internet: helpdeskecma.ch12,65 mm Wide Magnetic TapeCartridge for InformationInterchange - Helical ScanRecording - DATA-D3-1 Forma
2、t.Standard ECMA-2102nd Edition - December 1995Standardizing Information and Communication SystemsPhone: +41 22 849.60.00 - Fax: +41 22 849.60.01 - URL: http./www.ecma.ch - Internet: helpdeskecma.chMB Ecma-210.doc 20-10-98 12,1312,65 mm Wide Magnetic TapeCartridge for InformationInterchange - Helical
3、 ScanRecording - DATA-D3-1 Format.Brief HistoryECMA has produced a series of Standards for cassettes and cartridges containing magnetic tapes of different widths andcharacteristics.ECMA Standards for cartridges containing tape nominally 12,7 mm wide and recorded in a linear mode are:ECMA-120 (1993)
4、: Data Interchange on 12,7 mm 18-Track Magnetic Tape CartridgesECMA-152 (1993) : Data Interchange on 12,7 mm 18-Track Magnetic Tape Cartridges - Extended FormatECMA-182 (1992) : Data Interchange on 12,7 mm 48-Track Magnetic Tape Cartridges - DLT 1 FormatECMA-196 (1993) : Data Interchange on 12,7 mm
5、36-Track Magnetic Tape CartridgesECMA-197 (1993) : Data Interchange on 12,7 mm 112-Track Magnetic Tape Cartridges - DLT 2 FormatECMA-209 (1994) : Data Interchange on 12,7 mm 128-Track Magnetic Tape Cartridges - DLT3 FormatECMA Standards for cartridges containing tape 3,81 mm or 8 mm wide, and record
6、ed in a helical mode are:ECMA-139 (1990) : 3,81 mm Wide Magnetic Tape Cartridges - Helical Scan Recording - DDS FormatECMA-145 (1990) : 8 mm Wide Magnetic Tape Cartridge for Information Interchange - Helical Scan RecordingECMA-146 (1990) : 3,81 mm Wide Magnetic Tape Cartridge for Information Interch
7、ange - Helical Scan Recording -DATA/DAT FormatECMA-150 (1992) : 3,81 mm Wide Magnetic Tape Cartridge for Information Interchange - Helical Scan Recording -DDS-DC FormatECMA-169 (1992) : 8 mm Wide Magnetic Tape Cartridge, Dual Azimuth Format for Information Interchange - HelicalScan RecordingECMA-170
8、 (1992) : 3,81 mm Wide Magnetic Tape Cartridge for Information Interchange - Helical Scan Recording -DDS Format using 60 m and 90 m Length TapesECMA-171 (1992) : 3,81 mm Wide Magnetic Tape Cartridge for Information Interchange - Helical Scan Recording -DATA/DAT-DC Format using 60 m and 90 m Length T
9、apesECMA-198 (1995) : 3,81 mm Wide Magnetic Tape Cartridge for Information Interchange - Helical Scan Recording -DDS-2 Format using 120 m Length TapesThis Standard ECMA-210 describes a cartridge containing magnetic tape 12,65 mm wide. The combination of the helical modeof recording and the wider tap
10、e gives a further increase in data capacity and data rate. Three types of cartridge are defined,containing tapes of different lengths.Adopted as 2nd Edition of Standard ECMA-210 by the General Assembly of December 1995.- i -Table of ContentsPageSection 1 - General 11 Scope 12 Conformance 12.1 Magnet
11、ic tape cartridge 12.2 Generating system 12.3 Receiving system 13 References 14 Definitions 24.1 a.c. erase 24.2 algorithm 24.3 Average Signal Amplitude 24.4 azimuth 24.5 back surface 24.6 Beginning of Tape (BOT) 24.7 Beginning of Tape Sense Slot 24.8 byte 24.9 cartridge 24.10 character 24.11 Codewo
12、rd Digital Sum (CDS) 24.12 Cyclic Redundancy Check (CRC) Character 24.13 Data Area Reference Point 24.14 Data Records 24.14.1 Logical Data Record (LDR) 24.14.2 Processed Data Record (PDR) 24.14.3 User Data Record (UDR) 24.15 Digital Sum Variation (DSV) 24.16 End of Tape (EOT) 34.17 End of Tape Sense
13、 Slot 34.18 Error Correcting Code (ECC) 34.19 File safe 34.20 Fixed Scan Group Header 34.21 flux transition position 34.22 flux transition spacing 34.23 Helical Time Code (HTC) 34.24 Internal Leader Header (ILH) 34.25 Logical Block Number 34.26 magnetic tape 34.27 Master Standard Reference Tape 34.2
14、8 Packet 34.29 Packet ldentifier 34.30 Packet Trailer 34.31 physical recording density 34.32 Postamble 34.33 Preamble 34.34 processed data 44.35 Reference Fields 4- ii -4.36 resolution 44.37 Scan Group 44.38 Scan Group Pair 44.39 Scan Group Start Data (SGSD) 44.40 Secondary Standard Reference Tape 4
15、4.41 Standard Reference Amplitudes (SRA) 44.42 Standard Reference Currents (Ir) 44.43 Tape Reference Edge 44.44 Test Recording Currents (TRC) 44.45 track 54.46 track angle 54.47 Typical Field (TF) 54.48 Variable Scan Group Header 54.49 zero crossing 55 Conventions and Notations 55.1 Representation o
16、f numbers 55.2 Names 56 Acronyms 57 Environment and Safety 67.1 Testing environment 67.2 Operating environment 67.3 Storage environment 67.4 Transportation 67.5 Safety 67.6 Flammability 7Section 2 - Requirements for the Cartridge 88 Dimensional and Mechanical Characteristics of the Cartridge 88.1 El
17、ements of the cartridge 88.2 Reference Planes of the case 88.3 Dimensions of the case 88.3.1 Overall dimensions 88.3.2 Locating areas 98.3.3 Reference points for Plane Y 98.3.4 Reference point for Plane Z 98.3.5 Locating notches 98.3.6 Mis-insertion protection 108.3.7 Stacking ribs 108.3.8 Recogniti
18、on notches 108.3.9 Write-inhibit mechanism 118.3.10 Label areas of the top side 118.3.11 Label areas of the rear side 128.3.12 Label area on the right hand side 128.3.13 Label area on the bottom side 138.3.14 Central window 138.3.15 Case opening 138.3.16 Tapers of the case 148.4 Flexibility of the c
19、ase 148.4.1 Requirements 148.4.2 Procedure 14- iii -8.5 Tape reel 158.5.1 Locking mechanism 158.5.2 Axis of rotation of the reel 158.5.3 Metallic insert 158.5.4 Toothed rim 158.5.5 Hub of the reel 168.5.6 Relative positions of hub and case 168.5.7 Characteristics of the toothed rim 178.6 Magnetic ta
20、pe 178.6.1 Tape wind 178.6.2 Wind tension 178.6.3 Circumference of the tape reel 178.6.4 Moment of inertia 178.7 Leader block 188.7.1 Dimensions of the leader block 188.7.2 Attachment of the tape to the leader block 188.7.3 Latching the leader block 198.8 Reflection density of the case 198.8.1 Requi
21、rement 198.8.2 Test Equipment 198.8.3 Test method 208.9 Colour 20Section 3 - Requirements for the Unrecorded Tape 289 Mechanical, physical and dimensional characteristics of the tape 289.1 Materials 289.2 Tape length 289.3 Tape width 289.4 BOT and EOT Sense Slots 289.5 Discontinuities 289.6 Thicknes
22、s 289.7 Longitudinal curvature 299.8 Straightness 299.9 Cupping 299.10 Out-of-plane distortions 299.11 Coating adhesion 299.12 Layer-to-layer adhesion 309.13 Youngs Modulus for the tape 309.14 Surface roughness 319.15 Electrical resistance of coated surfaces 319.16 Tensile strength 319.16.1 Breaking
23、 strength 319.16.2 Offset yield strength 329.17 Residual elongation 329.18 Light transmittance of the tape 3210 Magnetic Recording Characteristics 3210.1 General 3210.2 Basis for measuring the magnetic recording characteristics of the unrecorded tape. 3210.3 Test conditions 3210.4 Typical Field 33-
24、iv -10.5 Signal Amplitude 3310.6 Resolution 3310.7 Ease of Erasure 3310.8 Narrow-band Signal-to-Noise Ratio (NB-SNR) 3310.9 Tape Quality 3410.9.1 Missing pulses 3410.9.2 Missing pulse zones 34Section 4 - Requirements for an Interchanged Tape 3511 Format of a helically recorded track 3511.1 General d
25、escription of the write data path 3511.1.1 Formation of Packets 3511.1.2 Formation of Scan Groups 3511.1.3 Channel separation 3511.1.4 Interleave buffer 3511.1.5 Sync Blocks 3511.1.6 Randomization 3511.1.7 Logical helical track 3511.1.8 Byte translation 3511.1.9 Recording of tracks 3511.2 Packet for
26、mat 3711.2.1 Packet definition 3711.2.2 Packet ID 3711.2.3 UDR 3811.2.4 Packet Trailer 3811.3 Scan Group 3911.3.1 Scan Group Start Data (SGSD) 4011.3.2 Helical Time Code (HTC) 4011.3.3 Header 4111.3.4 Data Part 4511.3.5 Trailer 4511.3.6 Types of Scan Group 4511.3.7 Protection of Scan Groups 4911.4 W
27、rite data channel 4911.4.1 Scan Group sections 4911.4.2 Interleave Buffer 5011.4.3 Sync Blocks 5411.4.4 Layout of a logical helical track 5511.4.5 Byte translation 5612 Track geometry 5812.1 General 5812.2 Helically recorded tracks 5812.2.1 Track width 5812.2.2 Adjacent track pitch 5812.2.3 Track an
28、gle 5812.2.4 Straightness of a track 5812.2.5 Track length 5812.2.6 Azimuth angles 5812.2.7 Location of positive azimuth tracks 5812.2.8 Location of Data Area Reference Point 59- v -12.3 Time Code Track 5912.3.1 Track location 5912.3.2 Azimuth 5912.4 Servo Control Track 5912.4.1 Track location 5912.
29、4.2 Azimuth 5912.5 Reserved Longitudinal Track 5913 Method of recording helical tracks 6113.1 Tape condition before recording 6113.2 Method of recording 6113.3 Physical Recording Densities 6113.4 Nominal Bit Cell Length 6213.5 Long-term Average Bit Cell Length 6213.6 Short-term Average Bit Cell Leng
30、th (STA) 6213.7 Rate of Change of the STA 6213.8 Bit shift 6213.9 Read signal amplitude 6214 Servo Control Track 6214.1 Format 6214.2 Relative locations of Pulse Pairs and Scan Group Pairs 6214.3 Polarity of magnetisation 6214.4 Read signal amplitude 6314.5 Quality of the Servo Control Track 6315 Ti
31、me Code Track 6315.1 Format 6315.1.1 Count bits 6315.1.2 Supplementary Data 6315.1.3 Phase bit 6315.1.4 Synchronizing pattern 6315.2 Extent of a Time Code 6315.3 Relative locations of the Time Code and Scan Group Pairs 6315.4 Form of recording 6315.4.1 Nominal bit density 6415.4.2 Nominal bit cell l
32、ength 6415.4.3 Bit shift 6415.5 Read signal amplitude 6415.6 Quality of the Time Code Track 6416 Tape format 6516.1 Layout of the magnetic tape 6516.2 Data Area 6616.2.1 Capacity of tape sectors 6616.2.2 Sequence of Scan Groups on the tape 6616.2.3 Write skips 6816.2.4 Appended Data 6816.3 EOD 68Ann
33、ex A - Representation of the CRC used in 11.2 - Packet Format 69- vi -Annex B - Representation of the CRC used in 11.3 - Scan Group 71Annex C - Representation of 8-bit bytes by 14-bit patterns 73Annex D - Generation of Outer ECC and Inner ECC 85Annex E - Measurement of the geometry of helical tracks
34、 87Annex F - Measurement of Bit Shift 91Annex G - Label - Media type 95Annex H - Reflection density of the case 101Annex J - Measurement of light transmittance of tape 103Annex K - Recommendations for transportation 107Annex L - Guidelines for handling tape cartridges 109Annex M - Helical and Longit
35、udinal Time Codes 111Annex N - Representation of the CRC used in 11.3.2 - HTC 113Annex P - Bibliography 115Section 1 - General1 ScopeThis ECMA Standard specifies the physical and magnetic characteristics of a magnetic tape cartridge, using magnetictape 12,65 mm wide, so as to provide physical interc
36、hangeability of such cartridges. It also specifies the quality of therecorded signals, the recording method and the recorded format, thereby allowing data interchange between drives bymeans of such magnetic tape cartridges.This ECMA Standard specifies three types of cartridge which, for the purposes
37、 of this Standard, are referred to as TypeA, Type B and Type C.For Type A, the magnetic tape has a nominal length of 91 m and a nominal capacity of 10 GBytes.For Type B, the magnetic tape has a nominal length of 204 m and a nominal capacity of 25 GBytes.For Type C, the magnetic tape has a nominal le
38、ngth of 392 m and a nominal capacity of 50 GBytes.Together with a Standard for Volume and File Structure this Standard provides for full data interchange between dataprocessing systems.2 Conformance2.1 Magnetic tape cartridgeA claim of conformance with this ECMA Standard shall specify the Type of th
39、e cartridge. It shall be inconformance with this Standard ifG01 the cartridge meets all the requirements of clause 4 and clauses 7 to 10G01 the recording on the tape meets the requirements of clauses 11 to 16G01 for each recorded Packet the algorithm used for processing the data therein, if the reco
40、rded data has beenprocessed, has been registered and the registered identification is included in Byte 13 of the Packet ID of thisPacket (see 11.2.2)2.2 Generating systemA system generating a magnetic tape cartridge for interchange shall be entitled to claim conformance with thisStandard if all the
41、recordings that it makes, on all three Types of cartridge, meet the mandatory requirements of thisStandard. A claim of conformance shall state whether or not one, or more, registered algorithm(s) is (are)implemented and, if so, the registered number(s) of (all) the implemented algorithm(s).2.3 Recei
42、ving systemA system receiving a magnetic tape cartridge for interchange shall be entitled to claim conformance with thisStandard if it is able to handle any recording made on the tape according to this Standard, and for all three Types.A claim of conformance shall state whether or not one, or more,
43、registered algorithm(s) is (are) implemented and, ifso, the registered number(s) of (all) the implemented algorithm(s).3 ReferencesECMA-13 File Structure and Labelling of Magnetic Tapes for Information Interchange (1985)ECMA-129 Safety of Information Technology Equipment (SITE) (1994)ISO/R 527:1966
44、Plastics - Determination of tensile propertiesISO 1302:1992 Technical Drawings - Method of Indicating Surface Texture on DrawingsISO 683-13:1986 Heat-treatable steels, alloy steels and free-cutting steels - Part 13: Wrought stainless steels.ISO/IEC 11576:1993 Information Technology - Procedure for t
45、he Registration of Algorithms for the LosslessCompression of Data- 2 -4 DefinitionsFor the purposes of this Standard, the following definitions apply.4.1 a.c. eraseA process of erasure utilizing alternating magnetic fields of decaying intensity.4.2 algorithmA set of rules for transforming the logica
46、l representation of data.4.3 Average Signal AmplitudeThe average peak-to-peak value of the signal output of a read head measured over a minimum of 3 000 fluxtransitions, exclusive of missing pulses.4.4 azimuthThe angular deviation, in degrees of arc, of the recorded flux transitions on a track from
47、the line normal to the trackcentreline.4.5 back surfaceThe surface of the tape opposite to the magnetic coating used to record data.4.6 Beginning of Tape (BOT)The point along the tape indicated by the start of the density identification burst.4.7 Beginning of Tape Sense SlotA slot on the centreline
48、of the tape indicating the beginning of usable tape.4.8 byteAn ordered set of 8 bits acted upon as a unit.4.9 cartridgeA case containing a single reel of magnetic tape with a leader attached at the BOT end.4.10 characterA unit of information represented by one or more bytes.4.11 Codeword Digital Sum
49、 (CDS)The value of the Digital Sum Variation (DSV) taken over a single 14-bit pattern.4.12 Cyclic Redundancy Check (CRC) CharacterTwo bytes derived from information contained in the data bytes, pad bytes and other bytes.4.13 Data Area Reference PointThe physical position of the start of the first Outer ECC Sync Block of a positive azimuth helical track.4.14 Data Records4.14.1 Logical Data Record (LDR)The data entity received by the generating system from the host. It may consist of one, or several, Host DataRecord(s) depending upon the action take
