MIL-PRF-89020B
3.6.2.1 Nine (9) Track Tape. The physical characteristics of Nine (9)
track magnetic tape are as follows:
a.
Length: 2400 feet (maximum).
b.
Width:
.5 inch.
c.
Nine track recording format.
d.
Odd parity.
e. Inter-record gap:
.6 inch for 1600 bits per inch (BPI) Tapes;
.3 inch for 6250 BPI Tapes.
f. Physical end-of-tape markers at the beginning (beginning-of-
tape marker) and end of the tape (end-of-tape marker).
g.
Density-recording methods.
(1)
1600 BPI/Phase encoded.
(2) 6250 BPI/Group Coded Recording (GCR). Preferred NIMA
data exchange format (shall not be used unless agreed to by sender and
receiver).
3.6.2.2
Eight millimeter (8mm) Tape . The physical characteristics
of Eight millimeter (8mm) magnetic tape cartridges are as follows:
a.
Length: 112 meters (maximum).
b.
Width:
8 mm.
c.
Helical recording format.
d. Physical end-of-tape markers at the beginning (beginning-of-
tape marker) and end of the tape (end-of-tape marker).
e.
Density-recording methods.
5, 7, 10, 14 GB per data
cartridge.
3.6.3 Type of Input/Output (I/O) .
The individual records contain no
system dependent generated control words.
3.7
Record characteristics on Magnetic Tape .
3.7.1 Recorded labels. American National Standard Magnetic Tape Labels
for Information Interchange X3.27-1978. Recorded in ASCII code.
3.7.2
Data records.
a. Record size. Variable length, maximum 7214 bytes, minimum 14
bytes, modal (average) 2414 bytes.
b.
Blocking factor.
1:1 (block size = record size).
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