1、Standard ECMA-329December 2001Standardizing Information and Communication SystemsPhone: +41 22 849.60.00 - Fax: +41 22 849.60.01 - URL: http:/www.ecma.ch - Internet: helpdeskecma.ch8 mm Wide Magnetic TapeCartridge for InformationInterchange - Helical ScanRecording - AIT-3 FormatStandard ECMA-329Dece
2、mber 2001Standardizing Information and Communication SystemsPhone: +41 22 849.60.00 - Fax: +41 22 849.60.01 - URL: http:/www.ecma.ch - Internet: helpdeskecma.chMB ECMA-329.doc 29-01-02 15,158 mm Wide Magnetic TapeCartridge for InformationInterchange - Helical ScanRecording - AIT-3 Format.Brief Histo
3、ryTechnical Committee ECMA TC17 has produced a series of ECMA Standards for magnetic tape cassettes and cartridges ofdifferent widths, e.g. 12,7 mm, 8 mm, 6,35 mm and 3,81 mm. In each series, the standards correspond to specific types ofapplication and user requirements. Enhanced and new media also
4、correspond to advancements in drive technology. The seriesof helically recorded cartridges with a magnetic tape of 8 mm width comprises the following standards.ECMA-145 (1990) 8 mm Wide Magnetic Tape Cartridge for Information Interchange - Helical RecordingISO/IEC 11319ECMA-169 (1992) 8 mm Wide Magn
5、etic Tape Cartridge - Dual Azimuth Format for Information Interchange -ISO/IEC12246 Helical Scan recordingECMA-246 (1996) 8 mm Wide Magnetic Tape Cartridges for Information Interchange - Helical Scan RecordingISO/IEC 15780 AIT-1 FormatECMA-247 (1996) 8 mm Wide Magnetic Tape Cartridges for Informatio
6、n Interchange - Helical Scan RecordingISO/IEC 15718 HH-1 FormatECMA-249 (1996) 8 mm Wide Magnetic Tape Cartridge for Information Interchange - Helical Scan RecordingISO/IEC15718 DA-2 FormatECMA-293 (1999) 8 mm Wide Magnetic Tape Cartridge for Information Interchange - Helical Scan RecordingISO/IEC 1
7、8836 Mammoth-2 FormatECMA-291 (1999) 8 mm Wide Magnetic Tape Cartridges for Information Interchange - Helical Scan RecordingISO/IEC 18809 AIT-1 With MIC FormatECMA-292 (1999) 8 mm Wide Magnetic Tape Cartridges for Information Interchange - Helical Scan RecordingISO/IEC 18810 AIT-2 With MIC FormatECM
8、A-316 (2000) 8 mm Wide Magnetic Tape Cartridge for Information Interchange - Helical Scan RecordingISO/IEC 20062 VXA-1 FormatThe AIT-3 Format specified by this ECMA Standard represents an important advancement over the previous AIT Formatsthanks to a chip developed by Sony Corporation. The track pit
9、ch is reduced by half and the accessibility of the RMIC withoutmechanical contact avoids wear. As a result, when recorded on a 230-metre tape, a native capacity of 100 Gbytes and acompressed capacity of typically 200 Gbytes of user data can be achieved. For backward compatibility with previous forma
10、ts,AIT-3 drives have not only antennas for the RMIC but also contact pins for the MICs present in the previous formats. Thus,AIT-3 drives are able to read the MIC of AIT-1 and AIT-2 cartridges. They can identify the type of cartridge inserted (AIT-1,AIT-2, AIT-3 or else) by reading the MIC or the RM
11、IC.This ECMA Standard has been contributed to ISO/IEC for adoption under the fast-track procedure as an InternationalStandard.This ECMA Standard has been adopted by the ECMA General Assembly of December 2001.-i-Table of contentsSection 1 - General 11Scope 12 Conformance 12.1 Magnetic tape cartridge
12、12.2 Generating drive 12.3 Receiving drive 13 References 24 Definitions 24.1 Absolute Frame Number (AFN) 24.2 a.c. erase 24.3 Access 24.4 algorithm 24.5 Area ID 24.6 Automatic Track Finding (ATF) 24.7 Average Signal Amplitude 24.8 azimuth 24.9 back surface 24.10 byte 24.11 cartridge 24.12 Channel bi
13、t 24.13 Codeword 34.14 Early Warning Point (EWP) 34.15 End of Data (EOD) 34.16 Entity 34.17 Error Correcting Code (ECC) 34.18 flux transition position 34.19 flux transition spacing 34.20 Frame 34.21 Housekeeping Frame 34.22 Logical Beginning of Tape (LBOT) 34.23 magnetic tape 34.24 Master Standard A
14、mplitude Calibration Tape 34.25 Master Standard Reference Tape 34.26 Partition Boundary 34.27 Physical Beginning of Tape (PBOT) 34.28 Physical End of Tape (PEOT) 44.29 physical recording density 44.30 pre-recording condition 44.31 processing 44.32 processed data 44.33 Processed Record 44.34 record 4
15、4.35 Reference Field 44.36 Remote Memory In Cartridge (RMIC) 44.37 Secondary Standard Amplitude Calibration Tape 44.38 Secondary Standard Reference Tape 44.39 Separator Mark 44.40 Standard Reference Amplitude (SRA) 44.41 Standard Reference Current 5-ii-4.42 Tape Reference Edge 54.43 Test Recording C
16、urrent 54.44 track 54.45 Typical Field 54.46 unprocessed data 54.47 Unprocessed Record 55 Conventions and Notations 55.1 Representation of numbers 55.2 Names 56 Acronyms 57 Environment and safety 67.1 Test environment 67.2 Operating environment 67.3 Storage environment 67.4 Transportation 67.5 Safet
17、y 67.6 Flammability 6Section 2 - Requirements for the case 78 Dimensional and mechanical characteristics of the case 78.1 General 78.2 Overall dimension 78.3 Holding areas 88.4 Cartridge insertion 88.5 Window 98.6 Loading grips 98.7 Label areas 98.8 Datum areas and Datum holes 98.9 Support areas 108
18、.10 Recognition holes 118.11 Write-inhibit hole 118.12 Pre-positioning surfaces 128.13 Cartridge lid 128.14 Cartridge reel lock 148.15 Reel access holes 148.16 Interface between the reels and the drive spindles 158.17 Light path 168.18 Position of the tape in the case 168.19 Tape path zone 168.20 Ta
19、pe access cavity 178.21 Tape access cavity clearance 178.22 Requirements for the RMIC 178.23 Recognition recesses 18Section 3 - Requirements for the unrecorded tape 389 Mechanical, physical and dimensional characteristics of the tape 389.1 Materials 389.2 Tape length 389.2.1 Length of magnetic tape
20、38- iii -9.2.2 Length of leader and trailer tapes 389.2.3 Length of the splicing tapes 389.3 Tape width 389.3.1 Width of magnetic, leader and trailer tapes 389.3.2 Width and position of the splicing tape 389.4 Discontinuities 399.5 Tape thickness 399.5.1 Thickness of the magnetic tape 399.5.2 Thickn
21、ess of the leader and trailer tape 399.5.3 Thickness of the splicing tape 399.6 Longitudinal curvature 399.7 Cupping 399.8 Coating adhesion 399.9 Layer-to-layer adhesion 409.10 Tensile strength 409.10.1 Breaking strength 409.10.2 Yield strength 409.11 Residual elongation 409.12 Electrical resistance
22、 of the recording surface 419.13 Tape winding 419.14 Light transmittance of the tape 419.15 Recognition stripe 4110 Magnetic recording characteristics 4210.1 Typical Field 4210.2 Signal Amplitude 4210.3 Resolution 4310.4 Overwrite 4310.5 Ease of erasure 4310.6 Tape quality 4310.6.1 Missing pulses 43
23、10.6.2 Missing pulse zone 4310.7 Signal-to-Noise Ratio (SNR) characteristic 43Section 4 - Requirements for an interchanged tape 4411 Format 4411.1 General 4411.2 Basic Groups 4411.2.1 Entity 4511.2.2 Group Information Table 4611.2.3 Block Access Table (BAT) 4811.3 Sub-Groups 5011.3.1 G1 Sub-Group 50
24、11.3.2 G2 Sub-Group - Randomizing 5011.3.3 G3 Sub-Group 5111.4 Data Block 5211.4.1 ID information 5311.4.2 Recording of the ID Information in the Data Block Headers 5612 Method of recording 6112.1 Physical recording density 62-iv-12.2 Long-term average bit cell length 6212.3 Short-term average bit c
25、ell length 6212.4 Rate of change 6212.5 Bit shift 6212.6 Read signal amplitude 6212.7 Maximum recorded levels 6213 Track geometry 6213.1 Track configuration 6213.2 Average track pitch 6313.3 Variations of the track pitch 6313.4 Track width 6313.5 Track angle 6313.6 Track edge straightness 6313.7 Tra
26、ck length 6313.8 Azimuth angles 6314 Recorded patterns 6414.1 Recorded Data Block 6415 Format of tracks 6415.1 Track structure 6415.2 Positioning accuracy 6415.3 Tracking scheme 6415.4 Generation of Margin Blocks 6516 Layout of the tape 6616.1 Device Area 6616.2 Reference Area 6716.3 Position Tolera
27、nce Band No. 1 6716.4 System Area 6716.4.1 System Preamble 6716.4.2 System Log 6716.4.3 System Postamble 7116.4.4 Position Tolerance Band No. 2 7116.4.5 Vendor Group Preamble 7216.5 Data Area 7216.5.1 Vendor Group 7216.5.2 Recorded Data Group 7216.5.3 ECC3 7216.5.4 Multiple Recorded Instances 7316.5
28、.5 Repeated Frames 7316.5.6 Appending and overwriting 7416.6 EOD Area 7516.7 Optional Device Area 7616.8 Logical End Of Tape (LEOT) 7616.9 Logical Beginning of Tape (LBOT) 7616.10 Early Warning Point - EWP 7616.11 Empty Partition 7716.12 Initialization 7717 Housekeeping Frames 7717.1 Amble Frames 77
29、17.2 System Amble Frames 77-v-18 AIT Remote Memory In Cartridge (AIT RMIC) 7718.1 General 7718.2 Content of the AIT RMIC 7818.2.1 Manufacturers Information Section 7818.2.2 Communication Information Section 8118.2.3 Mechanism Error Log Information Section 8118.2.4 Memory Management Information Secti
30、on 8218.2.5 Volume Information Section 8318.2.6 Volume Use History Information Section 8418.3 Memory Heap Management 8418.3.1 Cell 8418.3.2 Cell Header 8418.3.3 Partition Information Cell 8618.3.4 Physical Tape Directory Information Cell 8618.3.5 User Volume Information Cell 8718.3.6 User Partition
31、Information Cell 8718.3.7 Application Information Cell 8718.3.8 Date and Time Stamp Information Section Cell 8918.3.9 Media Identification Information Cell 9018.3.10 Tape Alert Information Cell 9018.4 Electrical interface 9118.5 Environment 9118.5.1 Electromagnetic Compatibility 9118.5.2 Magnetic fi
32、elds 9118.5.3 X-rays 9118.6 Operating Field 9118.7 Message from AIT RMIC reader-writer to AIT RMIC 9118.8 Message from AIT RMIC to AIT RMIC reader-writer 9218.8.1 Load modulation 9318.9 EDC 9418.10 AIT RMIC states 9418.11 Command and Response 9518.11.1. Attention Command and Response 9618.11.2 Atten
33、tion Command and Response Type 1 9618.11.3 Attention Command and Response Type 2 9618.11.4 Read Command and Response 9618.11.5 Write Command and Response 9718.11.6 Status Command and Response 9718.11.7 Reset Command and Response 9818.12 Dialog 9818.12.1 Read data from AIT RMIC 9818.12.2 Write data t
34、o AIT RMIC 9918.12.3. Read and Write with Session ID 100Annex A - Measurement of light transmittance 105Annex B - Measurement of Signal-to-Noise Ratio 109Annex C - Method for determining the nominal and the maximum allowable recordedlevels (pre-recording condition) 111Annex D - Representation of 16-
35、bit words by 18-Channel bits patterns 113Annex E - Measurement of bit shift 115-vi-Annex F - Method of measuring the straightness of track edges 117Annex G - ECC calculation 119Annex H - Recommendations for transportation 123Annex J - Read-After-Write 125Annex K - Basic Group No. 0 127Annex L - Chip
36、 for the AIT-3 Format 129Annex M - Generation of EDC bytes for the Error Detecting Code for G2 Sub-Groups 131Section 1 - General1ScopeThis ECMA Standard specifies the physical and magnetic characteristics of an 8 mm wide magnetic tapecartridge containing a memory chip to enable physical interchange
37、of such cartridges between drives. It alsospecifies the quality of the recorded signals, the recording method and the recorded format - called AdvancedIntelligent Tape No. 3 (AIT-3 Format) - thereby allowing data interchange between drives by means of suchmagnetic tape cartridges.This ECMA Standard
38、specifies two types of cartridge depending on the thickness of the magnetic tapecontained in the case.Information interchange between systems also requires, at a minimum, agreement between the interchangeparties upon the interchange code(s) and the specifications of the structure and labelling of th
39、e information onthe interchanged cartridge.2 Conformance2.1 Magnetic tape cartridgeA tape cartridge shall be in conformance with this ECMA Standard if it meets all the mandatoryrequirements specified herein. The tape requirements shall be satisfied throughout the extent of the tape.2.2 Generating dr
40、iveA drive generating a magnetic tape cartridge for interchange shall be in conformance with this ECMAStandard if all recordings on the tape meet the mandatory requirements of this ECMA Standard, and ifeither or both methods of appending and overwriting are implemented. In addition, such a drive sha
41、ll beable to record the System Log in the AIT Remote Memory In Cartridge (AIT RMIC).A claim of conformance shall state which of the following optional features are implemented and which arenot the performing of a Read-After-Write check and the recording of any necessary repeated frames; the generati
42、on of ECC3 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 tocompress data received from the host prior to collecting the data into Basic Groups, and the registered identification number(s) of t
43、he implemented compression algorithm(s).2.3 Receiving driveA drive receiving a magnetic tape cartridge for interchange shall be in conformance with this ECMAStandard if it is able to handle any recording made on the tape according to this ECMA Standard. Inparticular it shall be able to read the Syst
44、em Log recorded in the AIT RMIC; be able to recognise repeated frames, and to make available to the host, data and Separator Marks fromonly one of these frames; be able to recognise multiple representations of the same Basic Group, and to make available to thehost, data and Separator Marks from only
45、 one of these representations; be able to recognise an ECC3 frame, and ignore it if the system is not capable of using ECC3 checkbytes in a process of error correction; be able to recognise processed data within an Entity, identify the algorithm used, and make itsregistered identification number ava
46、ilable to the host; be able to make processed data available to the host.-2-In addition a claim of conformance shall state whether or not the system is capable of using ECC3 check bytes in a process of error correction; whether or not one or more de-compression algorithm(s) are implemented within th
47、e system, and areable to be applied to compressed data prior to making such data available to the host; the registered identification number(s) of the compression algorithm(s) for which a complementary de-compression algorithm is implemented.3 ReferencesECMA-287 (1999) Safety of electronic equipment
48、ISO/R 527:1966 Plastics - Determination of tensile propertiesISO 1302:1992 Technical Drawings - Method of indicating surface texture on drawingsISO/IEC 11576:1994 Information Technology - Procedure for the registration of algorithms for thelossless compression of data4 DefinitionsFor the purposes of
49、 this ECMA Standard the following definitions apply.4.1 Absolute Frame Number (AFN)A sequence number encoded in a Frame.4.2 a.c. eraseA process of erasure using magnetic fields of decaying intensity.4.3 AccessA read or write pass over a partition.4.4 algorithmA set of rules for transforming the logical representation of data.4.5 Area IDAn identifier defining the area of the tape and specifying the types of Frame written.4.6 Automatic Track Finding (ATF)The method by which tracking is achieved.4.7 Average Signal AmplitudeThe average peak-to-peak value of the output signal fro
