1 - AS 3602-1988 INFORMATION PROCESSING-DATA INTERCHANGE ON 12.7 mm WIDE MAGNETIC TAPE CARTRIDGES-18 TRACKS, 1491 DATA BYTES PER
4 - PREFACE
5 - Contents
8 - Section 1: General
8 - 1.1 Scope
8 - 1.2 Conformance
8 - 1.3 Normative references
8 - 1.4 Definitions
8 - 1.4.1 Average Signal Amplitude:
8 - 1.4.2 back surface:
8 - 1.4.3 byte:
8 - 1.4.4 cartridge:
8 - 1.4.5 Cyclic Redundancy Check Character:
8 - 1.4.6 data density:
8 - 1.4.7 Error Correcting Code:
8 - 1.4.8 flux transition position:
8 - 1.4.9 flux transition spacing:
8 - 1.4.10 magnetic tape:
9 - 1.4.11 Master Standard Reference Tape:
9 - 1.4.12 physical recording density:
9 - 1.4.13 Postamble:
9 - 1.4.14 Preamble:
9 - 1.4.15 Reference Field:
9 - 1.4.16 Secondary Standard Reference Tape:
9 - 1.4.17 Standard Reference Amplitude:
9 - 1.4.18 Standard Reference Current:
9 - 1.4.19 Test Recording Current:
9 - 1.4.20 track:
9 - 1.4.21 Typical Field:
9 - 1.5 Environment and safety
9 - 1.5.1 Cartridge/tape testing environment
9 - 1.5.2 Cartridge operation environment
9 - 1.5.3 Cartridge storage environment
9 - 1.5.4 Safety requirements
9 - 1.5.5 Transportation
10 - Section 2: Tape requirements
10 - 2.1 Characteristics of the tape
10 - 2.1.1 Material
10 - 2.1.2 Tape length
10 - 2.1.3 Tape width
10 - 2.1.4 Tape discontinuity
10 - 2.1.5 Total thickness of tape
10 - 2.1.6 Base material thickness
10 - 2.1.7 Longitudinal curvature
10 - 2.1.8 Out-of-plane distortions
10 - 2.1.9 Cupping
10 - 2.1.10 Dynamic frictional characteristics
11 - 2.1.11 Coating adhesion
11 - 2.1.12 Flexural rigidity
12 - 2.1.13 Electrical resistance of coated surfaces
12 - 2.1.14 Tape durability
12 - 2.1.15 Inhibitor tape
12 - 2.1.16 Tape abrasivity
12 - 2.1.17 Pre-recording condition
12 - 2.1.18 Magnetic recording characteristics
14 - 2.1.19 Tape quality
15 - Section 3: Cartridge requirements
15 - 3.1 Dimensional and mechanical characteristics of the cartridge
15 - 3.1.1 Overall dimensions (figures 4 to 6)
15 - 3.1.2 Write-inhibit mechanism (figures 4 and 5)
15 - 3.1.3 Label area of the rear side (figures 5 and 6)
16 - 3.1.4 Label area of the top side (figure 5)
16 - 3.1.5 Case opening (figures 4, 5, 7 and 9)
16 - 3.1.6 Locating notches (figures 7, 8 and 10)
16 - 3.1.7 Locating areas (figure 7)
16 - 3.1.8 Inside configuration of the case around the case opening (figures 7 and 11)
16 - 3.1.9 Other external dimensions of the case (figure 8)
16 - 3.1.10 Central window (figure 7)
17 - 3.1.11 Stacking ribs
17 - 3.1.12 Flexibility of the case
17 - 3.1.13 Tape reel (figures 12 and 13)
18 - 3.1.14 Leader block (figure 15)
19 - 3.1.15 Attachment of the tape to the leader block (figure 16)
19 - 3.1.16 Latching mechanism (figure 17)
19 - 3.1.17 Tape wind
19 - 3.1.18 Wind tension
19 - 3.1.19 Circumference of the tape reel
19 - 3.1.20 Moment of inertia
26 - Section 4: Recording requirements
26 - 4.1 Method of recording
26 - 4.1.1 Physical recording density
26 - 4.1.2 Bit cell length
26 - 4.1.3 Average bit cell length
26 - 4.1.4 Long-term average bit cell length
26 - 4.1.5 Short-term average bit cell length
26 - 4.1.6 Rate of change
26 - 4.1.7 Bit shift
26 - 4.1.8 Total character skew
26 - 4.1.9 Read signal amplitude
26 - 4.1.10 Coincident missing pulses
26 - 4.2 Track format
26 - 4.2.1 Number of tracks
26 - 4.2.2 Reference Edge
27 - 4.2.3 Track positions
27 - 4.2.4 Track width
27 - 4.2.5 Azimuth
27 - 4.3 Data format
27 - 4.3.1 Types of bytes
28 - 4.3.2 Frame
29 - 4.3.3 Data block
31 - 4.3.4 Error Correcting Code ( ECC)
33 - 4.3.5 Recording of 8-bit bytes on the tape
33 - 4.3.6 Recorded Data Block
33 - 4.3.7 Data density
34 - 4.4 Tape format
34 - 4.4.1 Density Identification Burst
34 - 4.4.2 ID Separator Burst
34 - 4.4.3 Interblock Gaps
35 - 4.4.4 Erase Gaps
35 - 4.4.5 Tape Marks
35 - 4.4.6 Relation between Interblock Gaps, Erase Gaps and Tape Marks
36 - 4.4.7 First and last recording on the tape
36 - 4.4.8 Summary of th e tape format
38 - Annex A - Recommendations for transportation
38 - A.1 Environment
38 - A.1.1 Unrecorded cartridges
38 - A.1.2 Recorded cartridges
38 - A.2 Hazards
38 - A.2.1 Impact loads and vibration
38 - A.2.2 Extremes of temperature and humidity
38 - A.2.3 Effects of stray magnetic fields
38 - Annex B - Inhibitor tape
39 - Annex C - Tape abrasivity measurement procedure
39 - C.1 General
39 - C.2 Test fixture
39 - C.3 Procedure
41 - Annex D - Recommendations on tape durability
41 - D.1 Short-length durability/reliability
41 - D.2 Long-length durability/reliability
42 - Annex E - Pre-recording condition
42 - E.1 Explanation
42 - E.2 Procedure
43 - Annex F - Representation of 8-bit bytes by 9-bit patterns
46 - Annex G - Measurement of bit shift
46 - G.1 Read equipment
46 - G.2 Measurement
46 - G.3 Data Analysis
48 - Annex H - Dimensions of the cartridge