ECMA 146 : 1ED 90
Current
The latest, up-to-date edition.
3,81 MM WIDE MAGNETIC TAPE CARTRIDGE FOR INFORMATION INTERCHANGE - HELICAL SCAN RECORDING - DATA/DAT FORMAT
12-01-2013
SECTION I - GENERAL
1 SCOPE
2 CONFORMANCE
2.1 Magnetic Tape Cartridge
2.2 Generating System
2.3 Receiving System
3 REFERENCES
4 DEFINITIONS
4.1 Absolute Frame Number (AFN)
4.2 Area ID
4.3 Automatic Track Finding (ATF)
4.4 Average Signal Amplitude
4.5 Azimuth
4.6 Back Surface
4.7 Byte
4.8 Cartridge
4.9 Channel Bit
4.10 Data Format ID
4.11 End of Data (EOD)
4.12 End of Information (EOI)
4.13 End of Partition (EOP)
4.14 Error Correcting Code (ECC)
4.15 Flux Transition Position
4.16 Flux Transition Spacing
4.17 Frame
4.18 Group
4.19 Logical Beginning of Tape (LBOT)
4.20 Logical End of Tape (LEOT)
4.21 Magnetic Tape
4.22 Master Reference
4.23 Master Standard Amplitude Calibration Tape
4.24 Master Standard Reference Tape
4.25 Optimum Recording Field
4.26 Partition
4.27 Partition Reference
4.28 Physical Beginning of Tape (PBOT)
4.29 Physical End of Tape (PEOT)
4.30 Physical Recording Density
4.31 Pre-recording Condition
4.32 Record
4.33 Reference Recording Field
4.34 Secondary Standard Amplitude Calibration Tape
4.35 Secondary Standard Reference Tape
4.36 Separator
4.37 Standard Reference Amplitude
4.38 Tape Noise Amplitude
4.39 Tape Reference Edge
4.40 Track
5 ENVIRONMENT AND SAFETY
5.1 Testing Environment
5.2 Operating Environment
5.3 Storage Environment
5.4 Transportation
5.5 Safety
5.6 Flammability
SECTION II - REQUIREMENTS FOR THE CASE
6 DIMENSIONAL AND MECHANICAL CHARACTERISTICS OF THE CASE
6.1 General
6.2 Overall Dimensions (Fig. 6 and 7)
6.3 Loading Grip (Fig. 6)
6.4 Holding Areas (Fig. 6)
6.5 Notches of the Lid (Fig. 5 and 8)
6.6 Lid Dimensions (Fig. 6 to 8)
6.7 Optical Detection of the Beginning and End of Tape
(Fig. 9 and 12)
6.8 Bottom Side (Fig. 10 and 11)
6.8.1 Locking mechanism of the slider
6.8.2 Access holes
6.8.3 Recognition, Sub-datum and Write-inhibit
holes
6.8.4 Datum Holes
6.8.5 Access room for tape guides
6.8.6 Holes for accessing the hubs
6.8.7 Internal structure of the lower half
(Fig. 12)
6.8.8 Light path (Fig. 12)
6.8.9 Support Areas (Fig. 13)
6.8.10 Datum Areas (Fig. 13)
6.8.11 Relationship between Support and Datum Areas
and Reference Plane Z (Fig. 14)
6.9 Hubs (Fig. 15, 16)
6.10 Leader and Trailer Attachment
6.11 Interface between the Hubs and the Drive Spindles
(Fig. 17)
6.12 Opening of the Lid (Fig. 18)
6.13 Release of the Hub Locking Mechanism (Fig. 19, 20)
6.14 Label Area (Fig. 21, 22)
SECTION III - REQUIREMENTS FOR THE UNRECORDED TAPE
7 MECHANICAL, PHYSICAL AND DIMENSIONAL CHARACTERISTICS OF
THE TAPE
7.1 Materials
7.2 Tape Length
7.2.1 Length of Magnetic Tape
7.2.2 Length of Leader and Trailer Tapes
7.3 Tape Width
7.4 Discontinuities
7.5 Total Thickness
7.6 Longitudinal Curvature
7.7 Cupping
7.8 Coating Adhesion
7.9 Layer-to-Layer Adhesion
7.10 Tensile Strength
7.10.1 Breaking Strength
7.10.2 Yield Strength
7.11 Residual Elongation
7.12 Electrical Resistance of Coated Surfaces
7.13 Light Transmittance of Tape
8 MAGNETIC RECORDING CHARACTERISTICS
8.1 Optimum Recording Field
8.2 Signal Amplitude
8.3 Resolution
8.4 Overwrite
8.4.1 Physical Recording Densities of 750,6 and
3002 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) Characteristic
SECTION IV - REQUIREMENTS FOR AN INTERCHANGED TAPE
9 DATA/DAT FORMAT
9.1 General
9.2 Basic Groups
9.2.1 Basic Groups for Group Format 0
9.2.2 Basic Groups for Group Format 1
9.3 Sub-Groups
9.3.1 G1 Sub-groups
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 Pack Item No. 1
9.4.2 Pack Item No. 2
9.4.3 Pack Item No. 3
9.4.4 Pack Item No. 4
9.4.5 Pack Item No. 5
9.4.6 Pack Item No. 6
9.4.7 Pack Item No. 7
9.4.8 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
10 METHOD OF RECORDING
10.1 Physical Recording Density
10.2 Long-Term Average Bit Cell Length
10.3 Short-Term Average Bit Cell Length
10.4 Rate of Change
10.5 Bit Shift
10.6 Read Signal Amplitude
10.7 Maximum Recorded Levels
11 TRACK GEOMETRY
11.1 Track Configuration
11.1.1 Average Track Pitch
11.1.2 Variations of the track pitch
11.1.3 Track Width
11.1.4 Track Angle
11.1.5 Track Edge Linearity
11.1.6 Track Length
11.1.7 Ideal Tape Centreline
11.1.8 Azimuth Angles
12 RECORDING OF BLOCKS ON THE TAPE
12.1 Recorded Main Data Block
12.2 Recorded Sub Data Block
12.3 Margin Blocks, Preamble Blocks and Postamble
Blocks
12.4 Spacer Blocks
13 FORMAT OF A TRACK
13.1 Track Capacity
13.2 Positioning Accuracy
13.3 Tracking Scheme
14 GROUP FORMATS
14.1 Group Format 0
14.2 Group Format 1
14.3 Extended Gap Frames
14.3.1 Extended Leading Gap Frames
14.3.2 Extended Trailing Gap Frames
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 Load/Unload 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 Partition 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 EOI
15.5 Repeated Groups
15.6 Repeated Frames within a Normal Group
15.7 Relocation of Defective Groups
15.8 Appending
15.8.1 Seamless Appending
15.8.2 Non-Seamless Appending
15.9 Overwrite
15.9.1 Overlapped Track Width
15.9.2 Non-overlapped Track Width
15.9.3 Rules for Overwrite
SECTION V - 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 NOMINAL AND THE
MAXIMUM ALLOWABLE RECORDED LEVELS
APPENDIX G - REPRESENTATION OF 8-BIT BYTES BY 10-BIT
PATTERN
APPENDIX H - MEASUREMENT OF BIT SHIFT
APPENDIX J - RECOMMENDATIONS FOR TRANSPORTATION
APPENDIX K - METHOD OF MEASURING TRACK EDGE LINEARITY
APPENDIX L - READ-AFTER-WRITE
APPENDIX M - DATA ALLOCATION AND C3 PARITY
Describes the physical and magnetic characteristics of a 3,81 mm wide magnetic tape cartridge to enable interchangeability of such cartridges. Also specifies the quality of the recorded signals, and the format and recording method, thereby allowing data interchange by means of such magnetic tape cartridges.
DocumentType |
Standard
|
PublisherName |
European Computer Manufacturers Association
|
Status |
Current
|
Standards | Relationship |
ISO/IEC 11321:1992 | Corresponds |
ECMA 129 : 1994 | INFORMATION TECHNOLOGY EQUIPMENT - SAFETY |
ISO/R 527:1966 | Plastics Determination of tensile properties |
ISO 1302:2002 | Geometrical Product Specifications (GPS) Indication of surface texture in technical product documentation |
ISO/IEC 646:1991 | Information technology ISO 7-bit coded character set for information interchange |
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