1、ECMA EU R O PEAN COMPUTER MAN U PACTUBERS ASSOCIATION STANDARD ECMA-146 3,Sl mm WIDE MAGNETIC TAPE CARTRIDGE FOR INFORMATION INTERCHANGE - HELICAL SCAN RECORDING - DATA/DAT FORMAT December 1990 ECMA ECMA*i(/4b 90 3404593 O002487 _ T - BRIEF HISTORY ECMA have produced a series of .ECMA Standards for
2、cassettes and cartridges containing magnetic tapes of different width and characteristics. Data Interchange 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 Usin
3、g IMFM Recording at 252 ftpmm Data Interchange on 6,30 mm Magnetic Tape Cartridge Using NE1 Recording at 394 ftpmm - Streaming Mode Data Interchange on 12,7 mm 18-Track Magnetic Tape Cartridges - Helical Scan Recording - DDS Format - Helical Scan Recording ECMA-34 (1976) : ECMA-46 (1976) : ECMA-79 (
4、1985) : ECMA-98 (1985) : ECMA-120 (1987) : ECMA-139 (1990) : 3,81 mm Wide Magnetic Tape Cartridge for Information Interchange ECMA-145 (1990) : 8 mm Wide Magnetic Tape Cartridge for Information Interchange The first five of these media were designed for the digital recording of data for storage and
5、processing in data processing systems. In recent years, other magnetic media, originally developed for audio and video applications, have been considered for use in data processing applications for storage as well as for information interchange. The recording method known as helical scan recording,
6、together with new types of magnetic tapes, allows to achieve capacities of more than 1 gigabyte of user data. Standard ECMA-139 was the first of a series of ECMA Standards for such magnetic tape cartridges. Upon request of Committee ISO/IEUJTCl/SCll it has been contributed to ISOIIEC for adoption as
7、 an International Standard under the fast-track procedure. The present Standard is a second standard for the same medium but for a different format. Also upon request of ISO/IEUJTCI/SCll, this ECMA Standard has been contributed to IS0 for adoption as an International Standard under the fast-track pr
8、ocedure. Adopted as an ECMA Standard by the General Assembly of 13th December 1990. ECMA ECMA*14b 90 = 3404593 0002488 I - TABLE OF CONTENTS Page SECTION I - GENERAL 1. SCOPE 2. CONFORMANCE 2.1 Magnetic Tape Cartridge 2.2 Generating System 2.3 Receiving System 3. REFERENCES 4. DEFINITIONS 1 1 1 1 1
9、4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 4.10 4.1 1 4.12 4.13 4.14 4.15 4.16 4.17 4.18 4.19 4.20 4.21 4.22 4.23 4.24 4.25 4.26 4.27 4.28 4.29 4.30 Absolute Frame Number (AFN) Area ID Automatic Track Finding (ATF) Average Signal Amplitude Azimuth Back Surface Byte Cartriilge Channel Bit Data Format ID End
10、 of Data (EOD) End of Information (EOI) End of Partition (EOP) Error Correcting Code (ECC) Flux Transition Position Flux Transition Spacing Frame Group Logical Beginning of Tape (LBOT) Logical End of Tape (LEOT) Magnetic Tape Master Reference Master Standard Amplitude Calibration Tape Master Standar
11、d Reference Tape Optimum Recording Field Parti tion Partition Reference Physical Beginning of Tape (PBOT) Physical End of Tape (PEOT) Physical Recording Density 1 1 1 1 2 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 4.31 4.32 4.33 4.34 4.35 4.36 4.37 4.38 4.39 4.40 ECMA ECMA*(L4b 70 3404573 000
12、2487 3 Pre-recording Condition Record Reference Recording Field Secondary Standard Amplitude Calibration Tape Secondary Standard Reference Tape Separator Standard Reference Amplitude Tape Noise Amplitude Tape Reference Edge Track 5. ENVIRONMENT AND SAFETY 5.1 Testing Environment 5.2 Operating Enviro
13、nment 5.3 Storage Environment 5.4 Transportation 5.5 Safety 5.6 Flammability 6. DIMENSIONAL AND MECHANICAL CHARACTERISTICS OF THE CASE 6.1 6.2 6.3 6.4 6.5 6.6 6.7 6.8 General Overall Dimensions (Fig. 6 and 7) Loading Grip (Fig. 6) Holding Areas (Fig. 6) Notches of the Lid (Fig. 5 and 8) Lid Dimensio
14、ns (Figs. 6 to 8) Optical Detection of the Beginning and End of Tape (Fig, 9 and 12) Bottom Side (Fig. 10 and 11) 6.8.1 6.8.2 6.8.3 6.8.4 6.8.5 6.8.6 6.8.7 6.8.8 6.8.9 6.8.1 O 6.8.1 1 Locking mechanism of the slider Access holes Recognition, Sub-datum and Write-inhibit holes Datum Holes Access room
15、for tape guides Holes for accessing the hubs Internal structure of the lower half (Fig, 12) Light path (Fig. 12) Support Areas (Fig. 13) Datum Areas (Fig. 13) Relationship between Support and Datum Areas and Reference Plane Z (Fig. 14) 6.9 Hubs (Fig. 15, 16) 6.10 Leader and Trailer Attachment 6.1 1
16、6.12 6.13 6.14 Interface between the Hubs and the Drive Spindles (Fig. 17) Opening of the Lid (Fig. 18) Release of the Hub Locking Mechanism (Fig. 19, 20) Label Area (Fig. 21, 22) 3 3 3 4 4 4 4 4 4 4 4 4 5 5 5 5 5 5 5 6 6 7 7 7 8 8 8 9 9 11 11 12 12 13 13 13 14 14 14 14 15 15 15 ECMA ECMA*L4b 90 W 3
17、404593 0002490 T SECTION III - REQUIREMENTS FOR THE UNRECORDED TAPE 7. MECHANICAL,PHYSICAL AND DIMENSIONAL CHARACTERISTICS OF THE TAPE 7.1 7.2 7.3 7.4 7.5 7.6 7.7 7.8 7.9 7.10 7.11 7.12 7.13 Materials Tape Length 7.2.1 Length of Magnetic Tape 7.2.2 Tape Width Discontinuities Total Thickness Longitud
18、inal Curvature Cupping Coating Adhesion Layer-to-Layer Adhesion Tensile Strength 7.10.1 Breaking Strength 7.10.2 Yield Strength Residual Elongation Electrical Resistance of Coated Surfaces Light Transmittance of Tape Length of Leader and Trailer Tapes 8. MAGNETIC RECORDING CHARACTERISTICS 8.1 Optimu
19、m Recording Field 8.2 Signal Amplitude 8.3 Resolution 8.4 Overwrite 8.4.1 Physical Recorcig Densities o 750,6 anc 02 ftpmm 8.4.2 Physical Recording Densities of 83,4 ftpmm and 1001 ftpmm 8.5 Ease of Erasure 8.6 Tape Quality 8.6.1 Missing Pulses 8.6.2 Missing Pulse Zone 8.7 Signal-to-Noise Ratio (S/N
20、) Characteristic SECTION VI - REQUIREMENTS FOR AN INTERCHANGED TAPE 9. DATA/DAT FORMAT 9.1 General 9.2 Basic Groups 9.2.1 9.2.2 Basic Groups for Group Format O Basic Groups for Group Format 1 9.3 Sub-Groups 9.3.1 G1 Sub-groups 26 26 26 26 26 26 26 26 26 26 26 27 27 28 28 28 28 28 29 29 30 30 30 30 3
21、0 31 31 31 31 31 31 32 32 32 32 32 34 35 35 - 1 o. 11. 12. - iv - 9.3.2 G2 Sub-groups 9.3.3 G3 Sub-groups 9.3.4 G4 Sub-group 9.3.5 Main Data Block 9.4 Sub-Data Area 9.4.1 9.4.2 9.4.3 9.4.4 9.4.5 9.4.6 9.4.7 9.4.8 Pack Item No. 1 Pack item No. 2 Pack Item No. 3 Pack Item No. 4 Pack Item No. 5 Pack It
22、em No. 6 Pack Item No. 7 Sub Data Block 9.5 Basic Group Structure 9.5.1 User Data 9.5.2 System Data 9.5.3 Record ID List 9.5.4 Heuristic Recovery Data Area METHOD OF RECORDING 10.1 Physical Recording Density 10.2 10.3 10.4 Rate of Change 10.5 Bit Shift 10.6 Read Signal Amplitude 10.7 Maximum Recorde
23、d Levels Long-Term Average Bit Cell Length Short-Term Average Bit Cell Length TRACK GEOMETRY 11.1 Track Configuration 11.1.1 11.1.2 11.1.3 11.1.4 11.1.5 11.1.6 11.1.7 11.1.8 Average Track Pitch Variations of the track pitch Track Width Track Angle Track Edge Linearity Track Length Ideal Tape Centrel
24、ine Azimuth Angles RECORDING OF BLOCKS ON THE TAPE 12.1 Recorded Main Data Block 12.2 Recorded Sub Data Block 12.3 12.4 Spacer Blocks Margin Blocks, Preamble Blocks and Postamble Blocks 36 36 37 42 44 44 45 47 48 49 50 51 51 53 54 54 59 62 62 62 62 62 62 62 63 63 63 63 64 64 64 64 64 64 64 64 64 64
25、65 65 65 ECMA ECMA*l4b 90 3404593 0002492 3 -v- 13. FORMAT OF A TRACK 13.1 Track Capacity 13.2 Positioning Accuracy 13.3 Tracking Scheme 65 65 66 66 14. GROUP FORMATS 68 14.1 Group Format O 14.2 Group Format 1 14.3 Extended Gap Frames 14.3.1 Extended Leading Gap Frames 14.3.2 Extended Trailing Gap F
26、rames 14.4 Types of Groups 14.4.1 Normal Groups 14.4.2 Spare Groups 14.4.3 Amble Groups 14.4.4 Header Groups 15. MAGNETIC TAPE LAYOUT 15.1 LoadIUnload Area 15.2 Lead-in Area 15.2.1 Preamble 15.2.2 Header 15.2.3 Format Parameter Set 15.2.4 Master Reference 15.2.5 Postamble 15.3 Partition 15.3.1 Parti
27、tion Preamble 15.3.2 Partition Reference 15.3.3 Partition Postamble 15.3.4 Partition Data 15.3.5 End of Partition (EOP) 15.3.6 Unused Area 15.4 E01 15.5 Repeated Groups 15.6 15.7 Relocation of Defective Groups 15.8 Appending Repeated Frames within a Normal Group 15.8.1 Seamless Appending 15.8.2 Non-
28、Seamless Appending 15.9 Overwrite 15.9.1 Overlapped Track Width 15.9.2 Non-overlapped Track Width 15.9.3 Rules for Overwrite 68 68 69 69 69 70 70 70 70 70 71 71 72 72 72 14 79 86 87 87 87 99 99 100 100 100 101 101 101 102 102 104 104 105 105 105 ECMA ECMA*i(L4b 90 = 3404593 0002493 5 - vi - SECTIONV
29、 - APPENDICES APPENDIX A - MEASUREMENT OF LIGHT TRANSMITTANCE OF THE PRISMS APPENDIX B - RECOGNITION HOLES APPENDIX C - MEANS TO OPEN THE LID APPENDIX D - MEASUREMENT OF LIGHT TRANSMITTANCE OF TAPE AND LEADERS APPENDIX E - MEASUREMENT OF SIGNAL-TO-NOISE RATIO APPENDIX F - METHOD FOR DETERMINING THE
30、NOMINAL AND THE MAXIMUM ALLOWABLE RECORDED LEVELS APPENDIX G - REPRESENTATION OF the outputs of which are known and stated in relation to that of the master standard amplitude calibration tape. NOTE 4 The Secondary Standard Amplitude Calibration Tape can be ordered from the Sony Corporation, Audio D
31、evice Business Department, Component Marketing Group 4-10-18, Takanawa, Minato-ku, Tokyo 108, Japan, under Part Number W-7000 G until the year 2001. It is intended that these be used for calibrating tertiary tapes for use in routine calibration. Secondary Standard Reference Tape A tape the performan
32、ce of which is known and stated in relation to that of the master standard reference tape. NOTE 5 A Secondary Standard Reference Tape can be ordered from the Sony Corporation, Major Customer Division, Magnetic Products Group, 6-7-35, Ktashinagawa, Shinagawa-ku, Tokyo 141, Japan, under Part Number RS
33、D 1079 until the year 2001. It is intended that these be used for calibrating tertiary tapes for use in routine calibration. Separator A record containing no user data, which is used to separate data. Standard Reference Amplitude The Average Signal Amplitude from the tracks of positive azimuth of th
34、e Master Standard Amplitude Calibration Tape at a specified physical recording density. Tape Noise Amplitude The tape noise amplitude is the subtractive value of amplifier noise from total noise in rms. Tape Reference Edge The bottom edge of the tape when viewing the recording side of the tape with
35、the PEOT of the tape to the observers right. Track A diagonally positioned area on the tape along which a series of magnetic signals may be recorded. ENVIRONMENT AND SAFETY Unless otherwise stated, the conditions specified below refer to ambient conditions in the air immediately surrounding the cart
36、ridge. Testing Environment Unless otherwise stated, tests and measurements made on the tape cartridge to check the requirements of this Standard shall be carried out under the following conditions: Temperature : 23 OC f 2 “C Relative humidity : 40% to 60% Conditioning period before testing : 24 hour
37、s. ECMA ECMA*14b 90 E 3404593 0002498 4 - - -5 - 5.2 Operating Environment Cartridges used for data interchange shall be capable of operating under the following conditions: Temperature : 5 “C to 45 “C Relative humidity ; 20% to 80% Wet bulb temperature : 26 “C max. There shall be no deposit of mois
38、ture on or in the cartridge. Conditioning before operating: If a cartridge has been exposed during storage and/or transportation to a condition outside the above values, before use the cartridge shall be conditioned in the operating environment for a time at least equal to the period during which it
39、 has been out of the operating environment, up to a maximum of 24 hours. NOTE 6 Rapid variations of temperature should be avoided. 5.3 Storage Environment For long term or archived storage of cartridges the following conditions shall be observed: Temperature : 5 OC to 32 “C Rela tive hum id i ty : 2
40、0% to 60% Maximum wet bulb temperature : 26 “C max. The stray magnetic field at any point on the tape shall not exceed 4000 Alm. There shall be no deposit of moisture on or in the cartridge. 5.4 Transportation Recommended limits for the environment to which a cartridge may be subjected during transp
41、ortation, and the precautions to be taken to minimize the possibility of damage, are provided in Appendix J. 5.5 Safety The cartridge and its components shall satisfy the requirements of ECMA-129. 5.6 Flammability The cartridge and its components shall be made from material which, if ignited from a
42、match flame, do not continue to burn in a still carbon dioxide atmosphere. SECTION I1 - REQUIREMENTS FOR THE CASE 6. 6.1 General DIMENSIONAL AND MECHANICAL CHARACTERISTICS OF THE CASE The case of the cartridge shall comprise: - an upper half- a lower half, - a slider moveably mounted on the lower ha
43、lf, - a lid pivotally mounted on the upper half. in the drawings, using third angle projection, an embodiment of the cartridge is shown as an example. ECMA ECMA*lYb 90 3404593 0002499 b W -6 - Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 7 Fig. 8 Fig. 9 Fig. 10 Fig. 11 Fig. 12 Fig. 13 Fig. 14 Fig.
44、 15 Fig. 16 Fig. 17 Fig. 18 Fig. 19, 20 Fig. 21, 22 is a perspective view of the cartridge seen from the top. is a perspective view of the cartridge seen from the bottom. is a partial view of the rear side. is a schematic view showing the Reference Planes X, Y, and 2. shows the front side. shows the
45、 top side with the lid in closed position. shows the left side, shows the top side with the lid in open position. shows the left side with the lid in open position. shows the bottom side with the lid and the slide in closed position. shows the bottom side with the lid and the slider in open position
46、. is a view from the top of the inside of the lower half with the upper half removed. is a view of the bottom half with the lid and the slider in open position. is a view of the left side with the lid and the slider in open position. is a top view of a hub. is a side view of a hub with partial cross
47、 section. is a partial cross-section through a hub and both halves of the case showing the interface with the drive spindle. shows at a larger scale the lid in the open position. show at a larger scale the functional relationship between the lid and the locking mechanism of the hubs. show the label
48、areas on the top and the rear side. The dimensions are referred to three orthogonal Reference Planes X, Y, and 2 (Fig.4). Overall Dimensions (Fig. 6 and 7) The overall dimensions of the case with the lid in the closed position shall be: 6.2 L, = 73,O mm 1 0,3 mm = 54,O mm 1 0,3 mm 5 = 10,5 mm .t 0,2
49、 mm The edges formed by the rear side and left and right sides shall be rounded off with a radius R, = 55 mm max. The two edges of the lid shall be rounded off with a radius R2 = 0,s mm max. 6.3 Loading Grip (Fig. 6) The top side shall have a loading grip for loading and positioning the cartridge into the drive. The position and dimensions of the loading grip shall be L4 = 25,5 mm +, 0,3 mm L5 = 10mm min. Lb = 5,0 mm f 0,2 mm = 2,O mm min. The depth of the loading grip below surface of the top side shall be 0,s mm + 0,2 mm I - 0,O mm ECMA ECtlA*l146 90 m 3404593
