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ANSI INCITS 242 : 1994 : R1999
Superseded
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INFORMATION SYSTEMS - MAGNETIC TAPE CARTRIDGE FOR INFORMATION INTERCHANGE - 0.50 IN (12.65 MM), SERIAL SERPENTINE, 48-TRACK, 42 500 BPI (1673 BPMM)
Hardcopy , PDF
23-04-2024
English
01-01-2004
Foreword
1 Introduction
2 Normative references
3 Definitions
4 Environment and safety
4.1 Cartridge and tape testing environment
4.2 Cartridge operating environment
4.3 Cartridge storage environment
4.4 Transportation
4.5 Safety
5 Tape mechanical, electrical, and magnetic requirements
5.1 Material
5.2 Width
5.3 Total thickness
5.4 Base material thickness
5.5 Magnetic coating thickness
5.6 Discontinuity
5.7 Longitudinal curvature
5.8 Out-of-plane distortions
5.9 Cupping
5.10 Coating surface roughness
5.11 Coating adhesion
5.12 Layer-to-layer adhesion
5.13 Young's modulus
5.14 Flexural rigidity
5.15 Electrical resistance of the recording surface
5.16 Electrical resistance of the back surface
5.17 Pre-record condition
5.18 Inhibitor tape
5.19 Abrasivity
5.20 Tape and leader opacity
5.21 Tensile yield force
5.22 Friction coefficient
5.23 Coercivity
6 Tape magnetic-recording performance
6.1 Typical field
6.2 Signal amplitude
6.3 Resolution
6.4 Overwrite
6.5 Peak shift
6.6 Self erasure
7 Tape quality
7.1 Dropouts
7.2 Excessive duration error
7.3 Tape edge quality
7.4 Durability
8 Mechanical specifications of the tape cartridge
8.1 Cartridge case label areas
8.2 Cartridge positioning planes
8.3 Tape cartridge case material
8.4 File-protect mechanism
8.5 Reel lock mechanism
8.6 Tape winding
8.7 Winding tension
8.8 Tape-reel diameter
8.9 Tape-reel moment of inertia
8.10 Leader attachment
8.11 Cartridge leader position
8.12 Leader retract velocity
8.13 Tape exit angles
8.14 Tape access door
8.15 Tape position holes
9 Recording
9.1 Physical recording density
9.2 Bit-cell length
9.3 Flux transition spacing (peak shift)
9.4 Read signal amplitude
9.5 Azimuth
9.6 Channel skew
10 Tape format
10.1 Reference edge of tape
10.2 Direction of recording
10.3 Tape layout
10.4 Calibration/directory area
10.5 Data area
11 Format of data
11.1 General
11.2 Data bytes
11.3 Physical blocks
11.4 Logical blocks
11.5 Entities
12 Format and content of block structures
12.1 Preamble
12.2 Sync
12.3 Data field
12.4 Control field
12.5 Control field
12.6 Cyclical redundancy check (CRC)
12.7 Postamble
12.8 Use of logical blocks
13 Entity
14 Error handling
Annexes
Annex A (normative) - Pre-record condition and magnetic moment
measurement
Annex B (informative) - Recommendations for transportation
Annex C (informative) - Tape cartridge handling guidelines
Annex D (informative) - Recommendation on tape durability
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