1、ECMA ECMA*IJ2 92 9 3404593 0014399 550 9 ECMA EUROPEAN COMPUTER MANUFACTURERS ASSOCIATION I STANDARD ECMA - 182 DATA INTERCHANGE ON 12,7 mm 48=TRACK MAGNETIC TAPE CARTRIDGES - DLT 1 FORMAT - December 1992 ECMA ECMA*lB2 92 m 3404593 OOl4400 7T2 m Brief History ECMA have produced a series of ECMA Stan
2、dards for cassettes and cartridges containing magnetic tapes of different width and characteristics. ECMA-34 (1976) : ECMA-46 (1976) : ECMA-79 (1985) : ECMA-98 (1985) : Data Interchange on 3.81 mm Magnetic Tape Cassette (32 bpmm, Phase Encoded) Data Interchange on 6,30 mm Magnetic Tape Cartridge (63
3、 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 NFUl Recording at 394 ftpmm - Streaming Mode Data Interchange on 12,7 mm 18-Track Magnetic Tape Cartridges 3,81 mm Wide Magnetic Tape
4、Cartridge for Information Interchange - Helical Scan Recording - DDS Format 8 mm Wide Magnetic Tape Cartridge for Information Interchange, Helical Scan Recording 3,81 mm Wide Magnetic Tape Cartridge for Information Interchange - Helical Scan Recording - DATA/DAT Format 3.81 mm Wide Magnetic Tape Car
5、tridge 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 Cartridges - Extended Format 8 mm Wide Magnetic Tape Cartridge, Dual Azimuth Format - Helical Scan Recording 3,81 mm Wide Magnetic T
6、ape Cartridge for Information Interchange - Helical Scan Recording - DDS Format Using 60 m and 90 m Length Tapes ECMA-171 (1992) : 3,81 mm Wide Magnetic Tape Cartridge for Information Interchange - Helical Scan Recording - DATADAT-DC Format Using 60 m and 90 m Length Tapes This ECMA Standard concern
7、s a cartridge of a type different from that of Standards ECMA-120 and ECMA-152. Whilst the magnetic tape is also 12,7 mm wide, it is recorded on 48 physical tracks, thus also the format is different from these previous ECMA Standards. It is characterized by the fact that the physical tracks, recorde
8、d and read pairwise, constitute two groups, the first recorded and read in forward direction, the second in reverse direction. ECMA-120 (1987) : ECMA-139 (1990) : ECMA-145 (1990) : ECMA-146 (1990) : ECMA-150 (1991) : ECMA-152 (1991) : ECMA-169 (1992) : ECMA-170 (1992) : Adopted as an ECMA Standard b
9、y the General Assembly of December 1992. ECMA ECMA*IBZ 92 = 3404593 OOl1440L 639 = Table of contents Section 1 - General 1 Scope 2 Conformance 2.1 Magnetic tape cartridges 2.2 Generating systems 2.3 Receiving systems 3 References 4 Definitions 4.1 Average Signai Amplitude 4.2 azimuth 4.3 back surfac
10、e 4.4 Beginning-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 Log
11、ical Block 4.16 logical track 4.17 magnetic tape 4.18 Master Standard Reference Tape 4.19 object 4.20 physical block 4.21 physical recording density 4.22 physical track 4.23 Record 4.24 Reference Edge 4.25 Reference Field 4.26 Secondary Standard Reference Tape 4.27 Standard Reference Amplitude (SRA)
12、 4.28 Standard Reference Current 4.29 Test Recording Current 4.30 Typical Field Page 1 1 1 1 1 1 1 1 1 1 1 1 1 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 5 Conventions and notations 5.1 Representation of numbers 5.2 Names 5.3 Acronyms 6 Environment and safety 6.1 Cartridge and tape testing en
13、vironment. 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 Material 7.2 Width 5 7.3 Total thickness 7.4 Thickness of the
14、 base material 7.5 Thickness of the magnetic coating 7.6 Thickness of the back coating 7.7 Discontinuity 7.8 Longitudinal curvature 7.8.1 Requirement 7.8.2 Procedure 7.9 Out-of-Plane distortions 7.10 Cupping 7.11 Roughness of the coating surfaces 7.1 1.1 Roughness of the back coating surface 7.11.2
15、Roughness of the magnetic coating surface 7.12 Coating adhesion 7.13 Layer-to-layer adhesion 7.13.1 Requirements 7.13.2 Procedure 7.14 Modulus of elasticity 7.14.1 Requirement 7.14.2 Procedure 7.15 Flexural rigidity 7.15.1 Requirement 7.15.2 Procedure 7.16 Tensile yield force 7.16.1 Procedure 5 5 5
16、5 5 5 6 6 6 6 6 6 6 6 6 6 7 7 7 8 8 9 9 9 9 9 9 ECMA ECMA*LB2 92 = 3404593 0034403 403 W - iii - 7.17 Electrical resistance 9 7.17.1 Requirement 9 7.17.2 Procedure 9 7.18 Inhibitor tape 10 7.19 Abrasivity 10 7.19.1 Requirement 10 7.19.2 Procedure 10 7.20 Light transmittance of the tape and the leade
17、r 11 7.21 Coefficient of dynamic friction 11 7.21.1 Requirements 11 7.21.2 Procedure for the measurement of the friction between th magnetic surface and the back surface 11 7.21.3 Procedure for the measurement of the friction between the magnetic surface or the back surface and calcium titanate cera
18、mic 12 8 Magnetic recording characteristics 12 8.1 Typical Field 12 8.2 Signal amplitude 13 8.3 Resolution 13 8.4 Overwrite 13 8.4.1 Requirement 13 8.5 Peak shift 13 8.5.1 Requirement 13 8.5.2 Procedure 13 9 Tape quality 14 9.1 Missing pulses 14 9.1.1 Requirement 14 9.2 Missing pulse zone 14 9.2.1 R
19、equirement 14 9.3 Tape durability 14 Section 3 - Mechanical specifications of the tape cartridge 14 10 General 14 10.1 Bottom side and right side (figures 8 and 9) 15 10.2 Back side and left side (figures 10 and 11) 16 10.3 Tape reel (figures 8, 12 and 13) 17 10.4 Tape leader (figures 14, 15 and 16)
20、 17 10.5 Front side (figure 17) 19 10.6 Operation of the cartridge (figures 18 and 19) 19 10.7 Tape winding 20 10.8 Moment of inertia 20 10.9 Material 20 ECMA ECMAML82 92 W 3404593 OOL4404 348 - iv - Section 4 - Requirements for an interchanged tape 11 Method of recording 11.1 Physical recording den
21、sity 11.2 Bit cell length 11.2.1 Average bit cell length 11.2.2 Long-term average bit cell length 11.2.3 Short-term average bit cell length 11.3 Fhx transition spacing 11.4 Read signal amplitude 11.5 Azimuth 11.6 Channel skew 12 Tape format 12.1 Reference Edge 12.2 Direction of recording 12.3 Tape l
22、ayout 12.4 Calibration 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 ph
23、ysical tracks 12.5.5 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 Control Field 1 (CFl) 13.6.5 Control Field 2 (CF2) 13.6
24、.6 CRC 13.6.7 Postamble 14 Use of Logical Blocks 30 30 30 30 30 30 30 30 30 30 30 31 31 31 31 31 32 32 32 33 34 34 34 34 34 34 34 37 38 38 38 38 39 39 39 40 40 40 41 42 44 44 44 ECMA ECMA*L82 92 m 3404593 OOL4405 1284 m -v- 14.1 Data Blocks 14.2 Tape Mark Blocks 14.3 Filler Blocks 14.4 End of Track
25、Blocks (EOTR) 14.5 End of Data Blocks OD) 14.6 ECC Blocks 15 Format of Entities 16 Error handling Annexes A - Measurement of light transmittance B - CRC generation C - ECC generation D - Format of Control Field 1 E - Format of Control Field 2 F - Recommendations for transportation G - Inhibitor tape
26、 H - Recommendations on tape durability J - Handling guidelines 44 44 44 44 44 44 44 45 47 51 53 57 59 61 63 65 67 ECMA ECMA*I,82 92 3404593 0014406 110 = 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,
27、7 mm wide, 48-track magnetic tape cartridge, to enable interchangeability of such cartridges. It also specifies the quality of the recorded signals, a format - called Digital Linear Tape 1 (DLT 1) - and a recording method. Together with a labelling standard, e.g. Standard ECMA-13 for Magnetic Tape L
28、abelling, 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 through
29、out the extent 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
30、system receiving 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 (1985) IS0 1302:1978 File Structure and Labelling of Magnetic Tapes for Information Interchan
31、ge Technical 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 1 674 ftpmm me
32、asured 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 co
33、ating 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 1 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
34、.16 4.17 4.18 4.19 4.20 ECMA ECMA*1Bi2 92 3404593 0014407 057 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 64-bit character, generated by a mathematical computation, used for er
35、ror detection. 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 t
36、he end 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
37、 point 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 tra
38、ck. logical 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 f
39、or reference field, signal amplitude, resolution, peakshift, and overwrite characteristics. NOTE 2 The Master Standard Reference Tape has been established by Digital Equipment Corporation. object A Record or a Tape Mark Block. physical block A set of contiguous bytes recorded on a physical track and
40、 considered as a unit. ECMA ECMA*3&2 92 W 3404593 0034408 T93 -3- 4.21 4.22 4.23 4.24 4.25 4.26 4.27 4.28 4.29 4.30 5 5.1 physical recording density The number of recorded flux transitions per unit length of track, expressed in flux transitions per millimetre (ftpmm). physical track A longitudinal a
41、rea on the tape along which a series of magnetic signals can be recorded. Record A collection of User Bytes, the number of which is determined by the host. 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 th
42、e observer. Reference Field The Typical Field of the Master Standard Reference Tape. 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 3 Secondary Standard Reference Tapes can be ordered until t
43、he year 2003 from Digital Equipment Corporation, Tapes Products Group, 334 South Street, Shrewsbury, Mass. 01545, USA. It is intended that these be used for calibrating tertiary reference tapes for routine calibration. Standard Reference Amplitude (SRA) The Average Signal Amplitude from the Master S
44、tandard Reference Tape when it is recorded with the Test Recording Current at 1 674 ftpmm. Standard Reference Current The current that produces the Reference Field. Test Recording Current The current that is 1.1 times the Standard Reference Current. Typical Field In the plot of the Average Signal Am
45、plitude against the recording field at the physical recording density of 1674 ftpmm, the minimum field that causes an Average Signal Amplitude equal to 95 % of the maximum Average Signal Amplitude. Conventons and notations Representation of numbers The following conventions and notations apply in th
46、is Standard, unless otherwise stated. - In each block and in each field the bytes shall be arranged with Byte 1, the least significant, first. Within each byte the bits shall be arranged with Bit 1, the least significant, first and Bit 8, the most significant bit, last. This order applies to the dat
47、a, and to the input and output of the error-detecting and error-correcting codes, and to the cyclic redundancy characters. - Letters and digits in parentheses represent numbers in hexadecimal notation. - The setting of bits is denoted by ZERO or ONE. 5.2 5.3 6 6.1 6.2 _._ - - ECMA ECMA*JBZ 92 m 3404
48、593 OOJ4409 92T W -4- - Numbers in binary notation and bit patterns are represented by strings of ZEROS and ONES shown with the most significant bit to the left. Names The names of basic elements, e.g. specific fields, are written with a capital initial letter. Acronyms BOT CF1 CF2 CRC ECC EDC EOD E
49、OT EOTR EW FCT1 FCT2 LEOT MFM RCTl RCT2 SRA Beginning of Tape Control Field 1 Control Field 2 Cyclic Redundancy Check (character) Error-Correcting Code Error-Detecting Code End of Data End of Tape End of Track Early Warning Forward Calibration Track 1 Forward Calibration Track 2 Logical End of Track Modified Frequency Modulation Reverse Calibration Track 1 Reverse Calibration Track 2 Standard Reference Amplitude Environment and safety Unless otherwise stated, the conditions specified below refer to the ambient conditions in the test or computer room and not to those within the tape dr
