1、Standard ECMA-2472ndEdition - June 1998Standardizing 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 - HH-1 Format.Standard ECM
2、A-2472ndEdition - June 1998Standardizing Information and Communication SystemsPhone: +41 22 849.60.00 - Fax: +41 22 849.60.01 - URL: http:/www.ecma.ch - Internet: helpdeskecma.chMB E-247-ii.doc 02-07-98 16,148 mm Wide Magnetic TapeCartridge for InformationInterchange - Helical ScanRecording - HH-1 F
3、ormat.Brief HistoryECMA have produced a series of ECMA standards for cassettes and cartridges containing magnetic tapes of differentwidths and characteristics. Of these, the following relate to helical scan recording.ECMA-139 (1990) 3,81 mm Wide Magnetic Tape Cartridge for Information Interchange -
4、Helical ScanRecording - 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 Interchange - Helical ScanRecording - DATA/DAT FormatECMA-150 (1991) 3,81 mm Wide Magnetic Tape
5、 Cartridge for Information Interchange - Helical ScanRecording - DDS-DC Format using 60 m and 90 m Length Tapes, 2nd EditionECMA-169 (1992) 8 mm Wide Magnetic Tape Cartridge Dual Azimuth Format for Information Interchange -Helical Scan RecordingECMA-170 (1992) 3,81 mm Wide Magnetic Tape Cartridge fo
6、r Information Interchange - Helical ScanRecording - DDS Format using 60 m and 90 m Length TapesECMA-171 (1992) 3,81 mm Wide Magnetic Tape Cartridge for Information Interchange - Helical ScanRecording - DATA/DAT-DC Format using 60 m and 90 m Length TapesECMA-198 (1995) 3,81 mm Wide Magnetic Tape Cart
7、ridge for Information Interchange - Helical ScanRecording - DDS-2 Format using 120 m Length TapesECMA-210 (1995) 12,65 mm Wide Magnetic Tape Cartridge for Information Interchange - Helical ScanRecording - DATA-D3-1 FormatECMA-236 (1996) 3,81 mm Wide Magnetic Tape Cartridge for Information Interchang
8、e - Helical ScanRecording - DDS-3 Format using 125 m Length TapesThis ECMA Standard specifies a magnetic tape cartridge. The HH-1 format, when recorded on a 8 mm wide tape thelength of which is 163 metres, will provide a storage capacity of 20 Gbytes of uncompressed user data or typically 40Gbytes o
9、f compressed user data.This Standard has been adopted as 2ndedition of ECMA-247 by the ECMA General Assembly of June 1998.- i -Table of contentsSection 1 - General 11 Scope 12 Conformance 12.1 Magnetic tape cartridge 12.2 Generating drive 12.3 Receiving drive 13 References 24 Definitions 24.1 Absolu
10、te Frame Address 24.2 a.c. erase 24.3 algorithm 24.4 Area ID 24.5 Average Signal Amplitude 24.6 azimuth 24.7 back surface 24.8 bit cell 24.9 byte4.10 cartridge 24.11 Channel bit 24.12 compressed data 24.13 Cyclic Redundancy Check (CRC) character 24.14 Data Format ID 24.15 End of Data (EOD) 34.16 Err
11、or Correcting Code 34.17 flux transition position 34.18 flux transition spacing 34.19 Frame 34.20 Logical Beginning of Tape (LBOT) 34.21 Logical Record 34.22 magnetic tape 34.23 Master Standard Reference Tape 34.24 Partition Boundary 34.25 Physical Beginning of Tape (PBOT) 34.26 Physical End of Tape
12、 (PEOT) 34.27 physical recording density 34.28 Reference Field 34.29 Secondary Standard Reference Tape (SSRT) 34.30 Standard Reference Amplitude (SRA) 44.31 Standard Reference Current 44.32 Tape Reference Edge 44.33 Test Recording Current 44.34 track 44.35 Typical Field 44.36 uncompressed data 45 Co
13、nventions and notations 45.1 Representation of numbers 45.2 Names 4- ii -6 Acronyms 57 Environment and safety 57.1 Testing environment 57.2 Operating environment 57.3 Storage environment 57.4 Transportation 57.5 Safety 67.6 Flammability 6Section 2 - Requirements for the case 68 Dimensional and mecha
14、nical characteristics of the case 68.1 General 68.2 Overall dimension 78.3 Holding areas 78.4 Cartridge insertion 78.5 Window (figure 1) 88.6 Loading grips 88.7 Label areas 88.8 Datum areas and datum holes 98.9 Support areas 108.10 Recognition holes 108.11 Write-inhibit hole 118.12 Pre-positioning s
15、urfaces 118.13 Cartridge lid 118.14 Cartridge reel lock 138.15 Reel access holes 148.16 Interface between the reels and the drive spindles 148.17 Light path 158.18 Position of the tape in the case 168.19 Tape path zone 168.20 Tape access cavity 168.21 Tape access cavity clearance requirements 16Sect
16、ion 3 - Requirements for the Unrecorded Tape 339 Mechanical, physical and dimensional characteristics of the tape 339.1 Materials 339.2 Tape length 339.2.1 Magnetic tape 339.2.2 Leader and trailer tapes 339.2.3 Splicing tape 339.3 Tape width 339.3.1 Width of magnetic tape 339.3.2 Width of leader and
17、 trailer tapes 339.3.3 Width and position of splicing tape 339.4 Discontinuities 339.5 Thickness 339.5.1 Thickness of the magnetic tape 339.5.2 Thickness of leader and trailer tape 349.5.3 Thickness of the splicing tape 349.6 Longitudinal curvature 349.7 Cupping 34- iii -9.8 Coating adhesion 349.9 L
18、ayer-to-layer adhesion 359.10 Tensile strength 359.10.1 Breaking strength 359.10.2 Yield strength 359.11 Residual elongation 359.12 Electrical resistance of coated surfaces 359.13 Tape winding 369.14 Light transmittance of tape 369.15 Media Recognition System (MRS) 3610 Magnetic recording characteri
19、stics 3710.1 Typical Field 3810.2 Signal amplitude 3810.3 Resolution 3810.4 Overwrite 3810.5 Ease of erasure 3810.6 Tape quality 3810.6.1 Missing pulses 3810.6.2 Missing pulse zone 3910.7 Signal-to-Noise Ratio (SNR) 39Section 4 - Requirements for an interchanged tape 3911 Format 3911.1 General 3911.
20、2 Information Matrix 4011.2.1 Loading the Information Matrix 4111.3 Sync Block 5411.3.1 Sync Block Data 5411.3.2 Sync Block Header 5411.3.3 Sync Block Header in Preamble Zone 5511.4 Data Zone 5511.4.1 Identification and arrangement of Information Blocks in the Data Zone of a Frame 5511.4.2 Identific
21、ation and arrangement of Sync Blocks in Data Zone of a Track 5512 Method of recording 5612.1 Physical recording density 5612.2 Long-term average bit cell length 5612.3 Short-term average bit cell length 5712.4 Rate of change 5712.5 Bit shift 5712.6 Read signal amplitude 5712.7 Recording current 5713
22、 Track geometry 5713.1 Track configuration 5713.2 Average track pitch 5813.3 Variations of the track pitch 5813.4 Track width 5813.5 Track angle 5813.6 Track edge linearity 5813.7 Track length 58- iv -13.8 Data Zone reference 5913.9 Azimuth angles 5914 Recording pattern 5914.1 Recorded Sync Block 59
23、14.2 Preamble Zone 5914.3 Postamble Zone 5915 Format of a track 5915.1 Track capacity 5915.2 Positioning accuracy 5915.3 Tracking scheme 6016 Layout of a Single Data Space tape 6016.1 Frame type 6016.1.1 Data Frame 6016.1.2 Gap Frame 6016.1.3 Long File Mark Frame 6016.1.4 Short File Mark Frame 6016.
24、1.5 Set Mark Frame 6016.1.6 End of Data Frame 6016.1.7 Format Frame 6016.1.8 Data Frame in System Area 6016.2 Device Area 6016.3 Reference Area 6016.4 System Area 6116.4.1 Guard Band No.1 6116.4.2 System Log Preamble 6116.4.3 System Log 6116.4.4 System Log Postamble 6116.4.5 Guard Band No.2 6116.4.6
25、 Data Area Preamble 6116.5 Data Area 6116.5.1 Long File Mark 6116.5.2 Short File Mark 6116.5.3 Set Mark 6116.5.4 Write operation 6216.5.5 Append and overwrite operations 6216.5.6 Rewritten Frames 6216.6 EOD Area 6216.7 Post-EOD Area 6217 Layout of a partitioned tape 6317.1 Overall magnetic tape layo
26、ut 6317.1.1 Device Area 6317.1.2 Partition 1 6317.1.3 Partition 0 6417.2 Partition Identification 64Annex A - Measurement of light transmittance of tape and leaders 67Annex B - Measurement of Signal-to-Noise Ratio 71- v -Annex C - Representation of 8-bit bytes by 10-bit patterns 73Annex D - Measurem
27、ent of bit shift 81Annex E - Measurement of track edge linearity tolerance 85Annex F - Recommendations for transportation 87Annex G - Example of the content of a Data Block in the System Area 89- vi -.Section 1 - General1ScopeThis ECMA Standard specifies the physical and magnetic characteristics of
28、an 8 mm wide magnetic tapecartridge so as to provide physical interchange of such cartridges between drives. It also specifies the qualityof the recorded signals, the recording method and the recorded format - called HH-1 format - therebyallowing for full data interchange between drives by means of
29、such magnetic tape cartridges.Information interchange between systems also requires, as a minimum, agreement between the interchangeparties upon the interchange code(s) and the specifications of the structure and labelling of the informationon the interchanged cartridge.2 Conformance2.1 Magnetic tap
30、e 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 driveA drive generating a magnetic tape cartridge for interchange shall be
31、 in conformance with this ECMAStandard if all recordings on the tape meet the mandatory requirements of this ECMA Standard.A claim of conformance shall state which of the following optional features are implemented and whichare notG01 the performing of a Read-After-Write check and the recording of a
32、ny necessary rewritten frames;G01 the generation of ECC3 Blocks.In addition a claim of conformance shall stateG01 whether or not, registered data compression algorithm(s) are implemented within the system and areable to compress data received from the host, andG01 the registered identification numbe
33、r(s) of the implemented 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 shallG01 be able to recognize rew
34、ritten frames and to make available to the host, data and File Marks from onlyone of these frames;G01 be able to recognize a ECC3 Block, and ignore it if the system is not capable of using ECC3 checkbytes in a process of error correction;G01 be able to recognize compressed data, identify the algorit
35、hm used, and make the algorithm registrationnumber available to the host;G01 be able to make compressed data available to the host.In addition a claim of conformance shall stateG01 whether or not the system is capable of using ECC3 check bytes in a process of error correction;G01 whether or not one
36、or more decompression algorithm(s) are implemented within the system, and areable to be applied to compressed data prior to making such data available to the host;G01 the registered identification number(s) of the data compression algorithm(s) for which a complementarydata decompression algorithm is
37、 implemented.- 2 -G01 whether or not the system is capable of updating the System Log(s) if the Write-inhibit Hole state sopermits.3 ReferencesISO 527-1:1993 Plastics - Determination of tensile properties - Part 1: General principles.ISO 1302:1992 Technical Drawings - Method of indicating surface te
38、xture on drawings.ISO/IEC 11576:1994 Information Technology - Procedure for the registration of algorithms for thelossless compression of data.ECMA-129 (1994) Information Technology Equipment - Safety4 DefinitionsFor the purposes of this ECMA Standard, the following definitions apply.4.1 Absolute Fr
39、ame AddressA sequence number, encoded in the Frame.4.2 a.c. eraseA process of erasure utilising alternating magnetic fields of decaying intensity.4.3 algorithmA set of rules for transforming the logical representation of data.4.4 Area IDIdentifier of an area of the tape.4.5 Average Signal AmplitudeT
40、he average peak-to-peak value of the output signal from the read head at the specified physical recordingdensity over a minimum of 20,7 mm of track, exclusive of missing pulses.4.6 azimuthThe angular deviation, in degrees of arc, made by the mean flux transition line with a line normal to thecentrel
41、ine of the recorded track.4.7 back surfaceThe surface of the tape opposite to the magnetic coating which is used to record data.4.8 bit cellA distance along the track allocated for the recording of a Channel bit.4.9 byteAn ordered set of bits acted upon as a unit.4.10 cartridgeA case containing magn
42、etic tape stored on twin hubs.4.11 Channel bitA bit after 8-10 transformation.4.12 compressed dataData which has been subjected to a compression algorithm.4.13 Cyclic Redundancy Check (CRC) characterA 16-bit character obtained from a mathematical calculation and used for error detection.4.14 Data Fo
43、rmat IDAn identifier specifying which data format is being used on the tape.- 3 -4.15 End of Data (EOD)The point on the tape at the end of the Frame which contains the last user data.4.16 Error Correcting CodeA mathematical computation yielding check bytes used for the detection and correction of er
44、rors.4.17 flux transition positionThat point on a magnetic tape which exhibits the maximum free-space flux density normal to the magnetictape surface.4.18 flux transition spacingThe distance along a track between successive flux transitions.4.19 FrameA pair of adjacent tracks with azimuths of opposi
45、te polarity, in which the track with the positive azimuthprecedes that with the negative azimuth.4.20 Logical Beginning of Tape (LBOT)The point along the length of the tape where a recording of data for interchange commences.4.21 Logical RecordRelated data, from the host, treated as a unit of inform
46、ation.4.22 magnetic tapeA tape which will accept and retain the magnetic signals intended for input, output and storage purposeson computers and associated equipment.4.23 Master Standard Reference TapeA tape selected as the standard for a Reference Field, Signal Amplitude, Resolution, Overwrite and
47、Signal-to-Noise Ratio.NoteThe Master Standard Reference Tape has been established by the Reliability Center for ElectronicComponents of Japan (RCJ).4.24 Partition BoundaryThe point along the length of a magnetic tape at which partition 1 ends and partition 0 commences.4.25 Physical Beginning of Tape
48、 (PBOT)The point where the leader tape is joined to the magnetic tape.4.26 Physical End of Tape (PEOT)The point where the trailer tape is joined to the magnetic tape.4.27 physical recording densityThe number of recorded flux transitions per unit length of track, expressed in flux transitions permill
49、imetre (ftpmm).4.28 Reference FieldThe Typical Field of the Master Standard Reference Tape.4.29 Secondary Standard Reference Tape (SSRT)A tape the performance of which is known and stated in relation to that of the Master Standard ReferenceTape.NoteSecondary Standard Reference Tapes can be ordered from RCJ, 1-1-12 Hachiman-cho, Higashikurume,Tokyo 203, Japan, under Part Number JRM 6143 until the year 2006. In principle such tapes will be- 4 -available for a period of 10 years from the first version of this Standard. However, by agreement betweenECMA and RCJ, this period may be shortened
