1、 ECMA ECMA-209 94 = 3404593 0039693 T3L Standard ECMA-209 December 1994 ECMA Standardizing Information and Communication Systems Data Interchange on 12,7 mrn 128-Track Magnetic Tape Cartridges - DLT 3 Format Phone: +41 22 849.60.00 - Fax: t41 22 786.52.31 - X.400: C=ch; A=arcorn, P=ecrna, O=genevane
2、t, OU1 =ecrna, S=helpdesk - Internet: HelpdeskQECMA.CH - ECHA ECMA-209 94 m 3404593 0039694 978 m Standard ECMA-209 December 1994 ECMA Standardizing Information and Communication Systems Data Interchange on 12,7 rnrn 128-Track Magnetic Tape Cartridges - DLT 3 Format Phone: i41 22 849.60.00 - Fax: +4
3、1 22 786.52.31 - X.400: C=ch; A=arcom, P=ecma, O=genevanet, OU1 =ecma. Shelpdesk - Internet: HelpdeskQECMA.CH Brief History ECMA have produced a series of ECMA Standards for cassettes and cartridges containing magnetic tapes of different width and characteristics. ECMA-34 (1 976) : ECMA-46 (1976) :
4、ECMA-79 (1985) : ECMA-98 (1985) : ECMA- 120 (1 993) ECMA-139 (1990) : ECMA-145 (1990) : ECMA-146 (1990) : ECMA-150 (1991) ECMA-152 (1993) : ECMA-169 (1992) ECMA-170 (1992) : ECMA-171 (1992) : ECMA- 182 (1 992) : ECMA- 196 (1 993) ECMA-197 (1993) : ECMA-198 (1993) : ECMA-210 (1994) : Data Interchange
5、 on 3,81 mm Magnetic Tape Cassette (32 bpmm, Phase Encoded) Data Interchange on 6,30 mm Magnetic Tape Cartridge (63 bpmm, Phase Encoded) Data Interchange on 6,30 mm Magnetic Tape Cartridge Using IMFM Recording at 252 ftpmm Data Interchange on 6,30 mm Magnetic Tape Cartridge Using NE1 Recording at 39
6、4 ftpmm - Streaming Mode Data Interchange on 12,7 mm 18-Track Magnetic Tape Cartridges 3,8 1 mm Wide Magnetic Tape Cartridge for Information Interchange - Helical Scan Recording - DDS Format 8 mm Wide Magnetic Tape Cartridge for Information Interchange, Helical Scan Recording 3,8 1 mm Wide Magnetic
7、Tape Cartridge for Information Interchange - Helical Scan Recording - DATADAT Format 3,81 mm Wide Magnetic Tape Cartridge for Information Interchange - Helical Scan Recording - DDS-DC Format Using 60 m and 90 m Length Tapes, 2nd Edition Data Interchange on 12,7 mm 18-Track Magnetic Tape Cartridges -
8、 Extended Format 8 mm Wide Magnetic Tape Cartridge, Dual Azimuth Format - Helical Scan Recording 3,81 mm Wide Magnetic Tape Cartridge for Information Interchange - Helical Scan Recording - DDS Format Using 60 m and 90 m Length Tapes 3,81 mm Wide Magnetic Tape Cartridge for Information Interchange -
9、Helical Scan Recording - DATADAT-DC Format Using 60 m and 90 m Length Tapes Data Interchange on 12,7 mm 48-Track Magnetic Tape Cartridges - DLT 1 Format - Data Interchange on 12,7 mm 36-Track Magnetic Tape Cartridges Data Interchange on 12,7 mm 112-Track Magnetic Tape Cartridges - DLT 2 Format - 3,8
10、1 mm Wide Magnetic Tape Cartridge for Information Interchange - Helical Scan Recording - DDS-2 Format using 120 m Length Tapes 12,65 mm Wide Magnetic Tape Cartridge for Information Interchange - Helical Scan Recording - DATA-D3-1 Format Standard ECMA-182 concerns a cartridge of a type different from
11、 that of Standards ECMA-120, ECMA-152 and ECMA-196. Whilst the magnetic tape is also 12,7 mm wide, i.e. is characterized by the fact that the physical tracks, recorded and read in pairs, constitute two groups, the first recorded and read in forward direction, the second in reverse direction. Standar
12、d ECMA- 197 constitutes a development of the cartridge specified in Standard ECMA-182 in that the number of tracks has been raised from 48 to 112, thus raising the total capacity of the cartridge accordingly. Both Standards ECMA-182 and ECMA-197 have been adopted by ISO/IEC under the fast-track proc
13、edure as International Standards ISOAEC 13421 and ISO/IEC 13962. This ECMA Standard specifies a further development of the DLT-formatted cartridges. By raising the number of tracks to 128 and adopting an enhanced format, a further capacity increase is achieved. Adopted as an ECMA Standard by the Gen
14、eral Assembly of December 1994. Section 1 - General 1 Scope 2 Conformance 2.1 Magnetic tape cartridges 2.2 Generating systems 2.3 Receiving systems 3 References - ECMA ECHA-209 94 3404573 0017b9b 740 Table of contents Page 4 Definitions 4.1 Average Signal Amplitude 4.2 azimuth 4.3 back surface 4.4 B
15、eginning-Of-Tape marker (BOT) 4.5 byte 4.6 cartridge 4.7 Cyclic Redundancy Check (CRC) character 4.8 Early Warning (EW) 4.9 Error-Detecting Code (EDC) 4.10 End-Of-Tape marker (EOT) 4.11 Entity 4.12 Error-Correcting Code (ECC) 4.13 flux transition position 4.14 flux transition spacing 4.15 Logical Bl
16、ock 4.16 logical track 4.17 magnetic tape 4.18 Master Standard Reference Tape 4.19 object 4.20 page 4.21 physical block 4.22 physical recording density 4.23 physical track 4.24 Record 4.25 Reference Edge 4.26 Reference Field 4.27 Secondary Standard Reference Tape 4.28 Standard Reference Amplitude (S
17、RA) 4.29 Standard Reference Current 4.30 Test Recording Current 4.31 Typical Field 5 Conventions and notations 5.1 Representation of numbers 5.2 Dimensions 5.3 Names 5.4 Acronyms 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 3 3 3 3 3 3 3 3 3 3 3 ECMA ECMA-209 94 = 3404593 00Lqb97 b7 - 11 - 6 En
18、vironment and safety 6.1 Cartridge and tape testing environment. 6.2 Cartridge operating environment 6.3 Cartridge storage environment 6.4 Safety 6.4.1 Safeness 6.4.2 Flammability 6.5 Transportation Section 2 - Requirements for the unrecorded tape 7 Mechanical and electrical requirements 7.1 Materia
19、l 7.2 Tape length 7.3 Width 7.4 Total thickness 7.5 Thickness of the base material 7.6 Thickness of the magnetic coating 7.7 Thickness of the back coating 7.8 Discontinuity 7.9 Longitudinal curvature 7.9.1 Requirement 7.9.2 Procedure 7.10 Out-of-Plane distortions 7.1 1 Cupping 7.12 Roughness of the
20、coating surfaces 7.12.1 Roughness of the back coating surface 7.12.2 Roughness of the magnetic coating surface 7.13 Coating adhesion 7.14 Layer-to-layer adhesion 7.14.1 Requirements 7.14.2 Procedure 7.15 Modulus of elasticity 7.15.1 Requirement 7.15.2 Procedure 7.16 Flexural rigidity 7.16.1 Requirem
21、ent 7.16.2 Procedure 7.17 Tensile yield force 7.17.1 Procedure 7.1 8 Electrical resistance 7.18.1 Requirement 7.18.2 Procedure 7.19 Inhibitor tape 7.20 Abrasivity 7.20.1 Requirement 4 5 5 5 5 5 5 5 5 6 6 6 6 6 6 6 6 6 6 6 7 7 7 8 8 8 9 9 9 9 9 9 9 9 10 10 10 7.20.2 Procedure 7.21 Light transmittance
22、 of the tape and the leader 7.22 Coefficient of dynamic friction 7.22.1 Requirements 7.22.2 Procedure for the measurement of the friction between the magnetic surface and the back surface 7.22.3 Procedure for the measurement of the friction between the magnetic surface or the back surface and calciu
23、m titanate ceramic 8 Magnetic recording characteristics 8.1 Typical Field 8.2 Signal amplitude 8.3 Resolution 8.4 Overwrite 8.4.1 Requirement 8.5 Peak shift 8.5.1 Requirement 8.5.2 Procedure 9 Tape quality 9.1 Missing pulses 9.1.1 Requirement 9.2 Missing pulse zone 9.2.1 Requirement 9.3 Tape durabil
24、ity Section 3 - Mechanical specifications of the tape cartridge 10 General 10.1 Bottom side and right side 10.2 Back side and left side 10.3 Tape reel 10.4 Tape leader 10.5 Front side 10.6 Operation of the cartridge 10.7 Tape winding 10.8 Moment of inertia 10.9 Material Section 4 - Requirements for
25、an interchanged tape 11 Method of recording 1 1.1 Physical recording density 11.2 Channel bit cell length 1 1.2.1 Average Channel bit cell length i 1.2.2 Long-term average Channel bit cell length 11.2.3 Short-term average Channel bit cell length 1 1.3 Flux transition spacing 1 1.4 Read signal amplit
26、ude 10 11 11 11 11 12 12 12 12 13 13 13 13 13 13 14 14 14 14 14 14 14 14 15 16 16 17 18 19 20 20 20 29 29 29 29 29 29 29 29 29 ECMA ECMA-207 74 = 3404573 0037677 45T = - iv - 11.5 Azimuth 11.6 Channel skew 12 Tape format 12.1 Reference Edge 12.2 Direction of recording 12.3 Tape layout 12.4 Calibrati
27、on and Directory Area 12.4.1 Scratch Area 12.4.2 Guard Area G1 12.4.3 Calibration Tracks Area 12.4.4 Guard Area G2 12.4.5 Directory Area 12.4.6 Guard Area G3 12.5 Data Area 12.5.1 Physical tracks 12.5.2 Width of the physical tracks 12.5.3 Logical tracks 12.5.4 Locations of the physical tracks 12.5.5
28、 Layout of tracks in the Data Area 13 Data format 13.1 Data Bytes 13.2 Logical Blocks 13.3 Data Blocks 13.4 Types of Logical Blocks 13.5 Entities 13.6 Logical Block format 13.6.1 Preamble 13.6.2 Sync 13.6.3 Data Field 13.6.4 EDC 13.6.5 Control Field 1 (CFl) 13.6.6 Control Field 2 (CF2) 13.6.7 CRC 13
29、.6.8 Postamble 14 Use of Logical Blocks 14.1 Data Blocks 14.2 Filler Blocks 14.3 End of Track Blocks (EOTR) 14.4 End of Data Blocks (EOD) 14.5 ECC Blocks 15 Format of Entities 16 Error handling Annexes A - Measurement of light transmittance B - Generation of the Data Blocks CRCs 30 30 30 30 30 30 31
30、 31 31 31 32 33 33 33 33 33 33 33 34 36 36 36 36 36 37 37 37 37 38 39 40 41 42 42 43 43 43 43 43 43 43 44 45 49 -v- C - ECC generation D - Generation of page CRCs E - Format of MAP entries F - Format of Control Field 1 G - Format of Control Field 2 H - Recommendations for transportation J - Inhibito
31、r tape K - Recommendations on tape durability L - Handling guidelines 51 55 57 59 61 63 65 67 69 ECMA ECMA-209 9Y 3YOLi593 OOL9OL 938 W Section 1 - General 1 2 2.1 2.2 2.3 3 4 4.1 4.2 4.3 4.4 4.5 Scope This ECMA Standard specifies the physical and magnetic characteristics of a 12,7 mm wide, 128-trac
32、k magnetic tape cartridge, to enable interchangeability of such cartridges. It also specifies the quality of the recorded signals, a format - called Digital Linear Tape 3 (DLT 3) - and a recording method. Together with a labelling standard, for instance Standard ECMA- 13 for Magnetic Tape Labelling,
33、 it allows full data interchange by means of such magnetic tape cartridges. Conformance Magnetic tape cartridges A magnetic tape cartridge shall be in conformance with this Standard if it satisfies all mandatory requirements of this Standard. The tape requirements shall be satisfied throughout the e
34、xtent of the tape. Generating systems A system generating a magnetic tape cartridge for interchange shall be entitled to claim conformance with this Standard if all the recordings that it makes on a tape according to 2.1 meet the mandatory requirements of this Standard. Receiving systems A system re
35、ceiving a magnetic tape cartridge for interchange shall be entitled to claim conformance with this Standard if it is able to handle any recording made on a tape according to 2.1. References ECMA- 13 (1 985) IS0 1302: 1992 File Structure and Labelling of Magnetic Tapes for Information Interchange Tec
36、hnical drawings - Method of indicating surface texture on drawings. Definitions For the purpose of this Standard, the following definitions apply. Average Signal Amplitude The average peak-to-peak value of the output signal from the read head at the physical recording density of 1 640 ftpmm measured
37、 over a minimum length of track of 25,4 mm, exclusive of missing pulses. azimuth The angular deviation, in minutes of arc, of the mean flux transition line of the recording made on a track from the line normal to the Reference Edge. back surface The surface of the tape opposite the magnetic coating
38、which is used to record data. Beginning-Of-Tape marker (BOT) A hole punched on the centreline of the tape towards the end nearest to the leader. byte An ordered set of bits acted upon as a unit. NOTE In this Standard, all bytes are 8-bit bytes. 4.6 4.7 4.8 4.9 4.10 4.11 4.12 4.13 4.14 4.15 4.16 4.17
39、 4.18 4.19 4.20 4.21 ECMA ECMA-209 94 3404593 0019702 874 W -2- cartridge A case containing a single supply reel of 12,7 mm wide magnetic tape with a leader attached at the outer end. Cyclic Redundancy Check (CRC) character A &bit character, generated by a mathematical computation, used for error de
40、tection. Early Warning (EW) A signal generated by the drive indicating the approaching end of the recording area. Error-Detecting Code (EDC) A mathematical computation yielding check bytes used for error detection. End-Of-Tape marker (EOT) A hole punched on the centreline of the tape towards the end
41、 farthest from the leader. Entity A group of ten Logical Blocks treated as a logical unit and recorded on a logical track. Error-Correcting Code (ECC) A mathematical computation yielding check bytes used for the correction of errors detected by the CRC and the EDC. flux transition position The point
42、 which exhibits the maximum free-space flux density normal to the tape surface. flux transition spacing The distance on the magnetic tape between successive flux transitions. Logical Block The two physical blocks simultaneously written on, or read from, the two physical tracks of a logical track. lo
43、gical track A pair of physical tracks that are written or read simultaneously. magnetic tape A tape that accepts and retains magnetic signals intended for input, output, and storage purposes on computers and associated equipment. Master Standard Reference Tape A tape selected as the standard for ref
44、erence field, signal amplitude, resolution, peakshift, and overwrite characteristics. NOTE The Master Standard Reference Tape is maintained by the Quantum Corporation. object A Record or a Tape Mark Block. Page A logical division of a physical block. physical block A set of contiguous bytes recorded
45、 on a physical track and considered as a unit. ECMA ECMA-209 94 = 3404593 00119703 700 -3- 4.22 physical recording density The number of recorded flux transitions per unit length of track, expressed in flux transitions per millimetre (ftpmm). 4.23 physical track A longitudinal area on the tape along
46、 which a series of magnetic signals can be recorded. 4.24 Record A collection of User Bytes, the number of which is determined by the host. 4.25 Reference Edge The bottom edge of the tape when viewing the magnetic coating of the tape with the BOT to the left and the EOT to the right of the observer.
47、 4.26 Reference Field The Typical Field of the Master Standard Reference Tape. 4.27 Secondary Standard Reference Tape A tape the Characteristics of which are known and stated in relation to those of the Master Standard Reference Tape. NOTE Secondary Standard Reference Tapes can be ordered under Refe
48、rence “SSRT/DLTI“ until the year 2003 from Quantum Corporation, 333 South Street, Shrewsbury, Mass. O1 545-41 95, USA. It is intended that these be used for calibrating tertiary reference tapes for routine calibration. 4.28 Standard Reference Amplitude (SRA) The Average Signal Amplitude from the Mas
49、ter Standard Reference Tape when it is recorded with the Test Recording Current at 1 640 ftpmm. 4.29 Standard Reference Current The current that produces the Reference Field. 4.30 Test Recording Current The current that is 1,l times the Standard Reference Current. 4.31 Typical Field In the plot of the Average Signal Amplitude against the recording field at the physical recording density of 1 640 ftpmm, the minimum field that causes an Average Signal Amplitude equal to 95 % of the maximum Average Signal Amplitude. 5 Conventions and notations 5.1 Representatio
