1、Standard ECMA-259June 1997Standardizing Information and Communication SystemsPhone: +41 22 849.60.00 - Fax: +41 22 849.60.01 - URL: http:/www.ecma.ch - Internet: helpdeskecma.chData Interchange on 12,7 mm208-Track Magnetic TapeCartridges - DLT 5 Format.Standard ECMA-259June 1997Standardizing Informa
2、tion and Communication SystemsPhone: +41 22 840.60.00 - Fax: +41 22 849.60.01 - URL: http:/www.ecma.ch - Internet: helpdeskecma.chMB - Ecma-259.doc - 04.07.97 11:33Data Interchange on 12,7 mm208-Track Magnetic TapeCartridges - DLT 5 Format.Brief HistoryTechnical Committee ECMA TC17 has produced a se
3、ries 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 new standards correspond to specific types ofapplication and different user requirements. Enhanced and new media correspond also to advancements in drive
4、 technology.The series of such cartridges with a magnetic tape of 12,7 mm width and longitudinally recorded tracks comprises the followingstandards.ECMA-120 (1993) : Data Interchange on 12,7 mm 18-Track Magnetic Tape CartridgesISO 9661ECMA-152 (1993) : Data Interchange on 12,7 mm 18-Track Magnetic T
5、ape Cartridges - Extended FormatISO/IEC 11559ECMA-182 (1992) : Data Interchange on 12,7 mm 48-Track Magnetic Tape Cartridges - DLT 1 Format -ISO/IEC 13421ECMA-196 (1993) : Data Interchange on 12,7 mm 36-Track Magnetic Tape CartridgesISO/IEC 14251ECMA-197 (1993) : Data Interchange on 12,7 mm 112-Trac
6、k Magnetic Tape Cartridges - DLT 2 Format -ISO/IEC 13962ECMA-209 (1994) : Data Interchange on 12,7 mm 128-Track Magnetic Tape Cartridges - DLT 3 FormatISO/IEC 14833ECMA-231 (1995) : Data Interchange on 12,7 mm 128-Track Magnetic Tape Cartridges - DLT 4 FormatISO/IEC 15305ECMA-258 (1997) : Data Inter
7、change on 12,7 mm 128-Track Magnetic Tape Cartridges - DLT 3-XT FormatStandards ECMA-182, ECMA-197, ECMA-209 and ECMA-231 concern a cartridge of a type different from that of StandardsECMA-120, ECMA-152 or ECMA-196. Whilst the magnetic tape is also 12,7 mm wide, these standards are characterized byt
8、he fact that the physical tracks, recorded and read in pairs, constitute two groups, the first recorded and read in forwarddirection, the second in reverse direction. The capacity and performance of the first four DLT cartridges have been improvedby raising the number of tracks from 48 in DLT 1 to 1
9、28 for DLT 4 and by using an improved magnetic tape in DLT 4.The present ECMA Standard for the DLT 5 cartridge uses the same tape as DLT 4. The number of tracks is raised to 208 andtheir layout is different. As a result a native capacity of 35 Gbytes or, with compressed data, of typically at least 7
10、0 Gbytes isachieved.All ECMA Standards listed above have been adopted by ISO/IEC as International Standards. The present ECMA Standard willalso be contributed to ISO/IEC for adoption as an International Standard under the fast-track procedure.Adopted as an ECMA Standard by the General Assembly of Ju
11、ne 1997.ii.Table of contentsPageSection 1 - General 11 Scope 12 Conformance 12.1 Magnetic tape cartridges 12.2 Generating systems 12.3 Receiving systems 13 References 14 Definitions 14.1 Average Signal Amplitude 14.2 azimuth 14.3 back surface 14.4 Beginning-Of-Tape marker (BOT) 24.5 byte 24.6 cartri
12、dge 24.7 Cyclic Redundancy Check (CRC) character 24.8 Early Warning (EW) 24.9 Error-Detecting Code (EDC) 24.10 End-Of-Tape marker (EOT) 24.11 Entity 24.12 Error-Correcting Code (ECC) 24.13 Envelope 24.14 Envelope size 24.15 flux transition position 24.16 flux transition spacing 24.17 logical track 2
13、4.18 magnetic tape 24.19 Master Standard Reference Tape 24.20 object 34.21 page 34.22 physical block 24.23 physical recording density 34.24 physical track 34.25 Record 34.26 Reference Edge 34.27 Reference Field 34.28 Secondary Standard Reference Tape 34.29 Standard Reference Amplitude (SRA) 34.30 St
14、andard Reference Current 34.31 Test Recording Current 34.32 Typical Field 35 Conventions and notations 35.1 Representation of numbers 35.2 Dimensions 45.3 Names 45.4 Acronyms 4- ii -6 Environment and safety 46.1 Cartridge and tape testing environment. 46.2 Cartridge operating environment 46.3 Cartri
15、dge storage environment 56.4 Safety 56.4.1 Safeness 56.4.2 Flammability 56.5 Transportation 5Section 2 - Requirements for the unrecorded tape 57 Mechanical and electrical requirements 57.1 Material 57.2 Tape length 57.3 Width 57.4 Total thickness 57.5 Discontinuity 57.6 Longitudinal curvature 57.6.1
16、 Requirement 57.6.2 Procedure 67.7 Out-of-Plane distortions 67.8 Cupping 67.9 Roughness of the coating surfaces 67.9.1 Roughness of the back coating surface 67.9.2 Roughness of the magnetic coating surface 67.10 Coating adhesion 67.11 Layer-to-layer adhesion 77.11.1 Requirements 77.11.2 Procedure 77
17、.12 Modulus of elasticity 87.12.1 Requirement 87.12.2 Procedure 87.13 Flexural rigidity 87.13.1 Requirement 87.13.2 Procedure 87.14 Tensile yield force 87.14.1 Procedure 97.15 Electrical resistance 97.15.1 Requirement 97.15.2 Procedure 97.16 Inhibitor tape 97.17 Abrasivity 97.17.1 Requirement 107.17
18、.2 Procedure 107.18 Light transmittance of the tape and the leader 107.19 Coefficient of dynamic friction 107.19.1 Requirements 107.19.2 Procedure for the measurement of the friction between the magnetic surface and the back surface 107.19.3 Procedure for the measurement of the friction between the
19、magnetic surface or the back surface andcalcium titanate ceramic 11- iii -8 Magnetic recording characteristics 118.1 Typical Field 128.2 Signal amplitude 128.3 Resolution 128.4 Overwrite 128.4.1 Requirement 128.5 Peak shift 128.5.1 Requirement 128.5.2 Procedure 129 Tape quality 139.1 Missing pulses
20、139.1.1 Requirement 139.2 Missing pulse zone 139.2.1 Requirement 139.3 Tape durability 13Section 3 - Mechanical specifications of the tape cartridge 1310 General 1310.1 Bottom side and right side 1410.2 Back side and left side 1510.3 Tape reel 1510.4 Tape leader 1610.5 Front side 1710.6 Operation of
21、 the cartridge 1810.7 Tape winding 1910.8 Moment of inertia 1910.9 Material 19Section 4 - Requirements for an interchanged tape 2811 Method of recording 2811.1 Physical recording density 2811.2 Channel bit cell length 2811.2.1 Average Channel bit cell length 2811.2.2 Long-term average Channel bit ce
22、ll length 2811.2.3 Short-term average Channel bit cell length 2811.3 Flux transition spacing 2811.4 Read signal amplitude 2811.5 Azimuth 2911.6 Channel skew 2912 Tape format 2912.1 Reference Edge 2912.2 Direction of recording 2912.3 Tape layout 2912.4 Calibration and Directory Area 2912.4.1 Scratch
23、Area 3012.4.2 Guard Area G1 3012.4.3 Calibration Tracks Area 3012.4.4 Guard Area G2 3112.4.5 Directory Area 31- iv -12.4.6 Guard Area G3 3112.5 Data Area 3112.5.1 Physical tracks 3212.5.2 Logical tracks 3413 Data format 3513.1 Data Bytes 3513.2 Data Blocks 3513.3 Types of Blocks 3613.4 Entities 3613
24、.5 Envelopes 3613.6 Block format 3613.6.1 Preamble 3713.6.2 Sync 3713.6.3 Data Field 3713.6.4 EDC 3813.6.5 Control Field 1 (CF1) 3913.6.6 Control Field 2 (CF2) 4013.6.7 CRC 4213.6.8 Postamble 4214 Use of blocks 4214.1 Data Blocks 4214.2 Filler Blocks 4214.3 End of Track Blocks (EOTR) 4214.4 End of D
25、ata Blocks (EOD) 4214.5 ECC Blocks 4215 Format of Entities 4216 Format of Envelopes 4317 Error handling 43Annex A - Measurement of light transmittance 45Annex B - Generation of the Data Block CRCs 49Annex C - ECC generation 51Annex D - Generation of page CRCs 55Annex E - Format of MAP entries 57Anne
26、x F - Format of Control Field 1 59Annex G - Format of Control Field 2 61Annex H - Recommendations for transportation 63Annex J - Inhibitor tape 65Annex K - Recommendations on tape durability 67Annex L - Handling guidelines 69.Section 1 - General1 ScopeThis ECMA Standard specifies the physical and ma
27、gnetic characteristics of a 12,7 mm wide, 208-track magnetic tapecartridge, to enable physical interchangeability of such cartridges between drives. It also specifies the quality of therecorded signals, a format - called Digital Linear Tape 5 (DLT 5) - and a recording method, thereby allowing datain
28、terchange between drives. Together with a labelling standard, for instance Standard ECMA-13 for Magnetic TapeLabelling, it allows full data interchange by means of such magnetic tape cartridges.2 Conformance2.1 Magnetic tape cartridgesA magnetic tape cartridge shall be in conformance with this ECMA
29、Standard if it satisfies all mandatoryrequirements of this Standard. The tape requirements shall be satisfied throughout the extent of the tape.2.2 Generating systemsA system generating a magnetic tape cartridge for interchange shall be in conformance with this ECMA Standard ifall the recordings tha
30、t it makes on a tape according to 2.1 meet the mandatory requirements of this ECMA Standard.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 to compressdata received from the host prior to collecting t
31、he data into blocks, and the registered identification number(s) of the implemented compression algorithm(s) .2.3 Receiving systemsA system receiving a magnetic tape cartridge for interchange shall be in conformance with this ECMA Standard if itis able to handle any recording made on a tape accordin
32、g to 2.1.In addition, it shall whether or not one, or more de-compression algorithm(s) are implemented within the system, and are able to tobe applied to de-compress data prior to making such data available to the host, the registered identification number(s) of the implemented compression algorithm
33、(s) .3 ReferencesECMA-13 (1985) File Structure and Labelling of Magnetic Tapes for Information InterchangeISO 1302:1992 Technical drawings - Method of indicating surface texture on drawings.ISO/IEC 11576:1994 Information technology - Procedure for the registration of algorithms for the losslesscompr
34、ession of data.4 DefinitionsFor the purpose of this ECMA Standard, the following definitions apply.4.1 Average Signal AmplitudeThe average peak-to-peak value of the output signal from the read head at the physical recording density of2 254 ftpmm measured over a minimum length of track of 25,4 mm, ex
35、clusive of missing pulses.4.2 azimuthThe angular deviation, in degrees of arc, of the mean flux transition line of the recording made on a track from theline normal to the Reference Edge.- 2 -4.3 back surfaceThe surface of the tape opposite the magnetic coating which is used to record data.4.4 Begin
36、ning-Of-Tape marker (BOT)A hole punched on the centreline of the tape towards the end nearest to the leader.4.5 blockA set of contiguous bytes recorded on a physical track and considered as a unit.4.6 byteAn ordered set of bits acted upon as a unit.NOTEIn this ECMA Standard, all bytes are 8-bit byte
37、s.4.7 cartridgeA case containing a single supply reel of 12,7 mm wide magnetic tape with a leader attached at the outer end.4.8 Cyclic Redundancy Check (CRC) characterA 64-bit character, generated by a mathematical computation, used for error detection.4.9 Early Warning (EW)A signal generated by the
38、 drive indicating the approaching end of the recording area.4.10 Error-Detecting Code (EDC)A mathematical computation yielding check bytes used for error detection.4.11 End-Of-Tape marker (EOT)A hole punched on the centreline of the tape towards the end farthest from the leader.4.12 EntityA group of
39、 twenty blocks treated as a logical unit and recorded on a logical track.4.13 Error-Correcting Code (ECC)A mathematical computation yielding check bytes used for the correction of errors detected by the CRC and theEDC.4.14 EnvelopeA group of Entities.4.15 Envelope sizeThe number of Entities in an En
40、velope.4.16 flux transition positionThe point which exhibits the maximum free-space flux density normal to the tape surface.4.17 flux transition spacingThe distance on the magnetic tape between successive flux transitions.4.18 logical trackA group of four physical tracks that are written or read sim
41、ultaneously.4.19 magnetic tapeA tape that accepts and retains magnetic signals intended for input, output, and storage purposes on computers andassociated equipment.- 3 -4.20 Master Standard Reference TapeA tape selected as the standard for Reference Field, signal amplitude, resolution, peakshift, a
42、nd overwritecharacteristics.NOTEThe Master Standard Reference Tape has been established by the Quantum Corporation.4.21 objectA Record or a page of type Tape Mark.4.22 pageA logical division of a block.4.23 physical recording densityThe number of recorded flux transitions per unit length of track, e
43、xpressed in flux transitions per millimetre(ftpmm).4.24 physical trackA longitudinal area on the tape along which a series of magnetic signals can be recorded.4.25 RecordA collection of User Bytes, the number of which is determined by the host.4.26 Reference EdgeThe bottom edge of the tape when view
44、ing the magnetic coating of the tape with the BOT to the left and the EOT tothe right of the observer.4.27 Reference FieldThe Typical Field of the Master Standard Reference Tape.4.28 Secondary Standard Reference TapeA tape the characteristics of which are known and stated in relation to those of the
45、 Master Standard Reference Tape.NOTESecondary Standard Reference Tapes can be ordered under Reference “SSRT/DLT4“from Quantum Corporation,333 South Street, Shrewsbury, Mass. 01545-4195, USA. It is intended that these be used for calibrating tertiaryreference tapes for routine calibration.In principl
46、e, these Secondary Standard Reference Tapes will be available for a period of 10 years from thepublication of the first version of this ECMA Standard. However, by agreement between ECMA and QuantumCorporation, this period may be changed to take into account the demand for such Secondary Standard Ref
47、erenceTapes.4.29 Standard Reference Amplitude (SRA)The Average Signal Amplitude from the Master Standard Reference Tape when it is recorded with the TestRecording Current at 2 254 ftpmm.4.30 Standard Reference CurrentThe current that produces the Reference Field.4.31 Test Recording CurrentThe curren
48、t that is 1,1 times the Standard Reference Current.4.32 Typical FieldIn the plot of the Average Signal Amplitude against the recording field at the physical recording density of2 254 ftpmm, the minimum field that causes an Average Signal Amplitude equal to 95 % of the maximum AverageSignal Amplitude
49、.- 4 -5 Conventions and notations5.1 Representation of numbersThe following conventions and notations apply in this Standard, unless otherwise stated. A measured value is rounded off to the least significant digit of the corresponding specified value. It implies thata specified value of 1,26 with a positive tolerance +0,01, and a negative tolerance -0,02 allows a range ofmeasured values from 1,235 to 1,275. In each block and in each field the bytes shall be arranged with Byte 1, the least significant, first. Withineach byte the bits shall be arranged with
