IBM System/370 145 Manual page 135

Table 20.27.1. 3410. 2401, and 241S Magnetic Tape Unit characteristics
3410 Tape Units
Characteristic
Model Model 2 Mo
Data rate
(KB)
20 40 80
Density
1600
1600
1600
(bytes/inch)
Tape speed 12.5 2S 50
(inches/sec. )
Recording PE PE PE
technique
Nominal inter block .6 .6 .6
gap size in inches
(nine-track)
Nominal gap passing 48.0 24.0 12.0
time
(ms)
Nominal read 15.0 12.0 6.0
access (ms)
In-column rewind Yes Yes Yes
Nominal rewind time
180 180 120
2400-foot reel (secs. )
Reel latch
Recording medium
(U2-inch
magnetic tape)
Push-pull
hub
Push-pull
hub
IBM Series/ Same as
500, IBM Model 1
Dynexcel,
IBM Heavy
Duty" or
competitive
formulations
that meet
the tape
reel 'criteria
in Tape
Specifications
(GA32-0006) •
IBM tapes
other than the
above do not
provide adequate
reliability and
should not be
used.
10.5-, 8.5-,
6.S- reels.
Push-pull
hub
Same as
Model 1
*Trademark of E. I. Dupont de Nemours' Co. (Inc.)
2401 Tape Units
Model
30
800
37.5
NRZI
.6
16
14.7
No
132
Quick
release
latch
Same as
3410 plus
Mylar*
Model 2 Model 4
60 60
800 1600
75 37.5
NRZI PE
.6 .6
8
16
7.9 16.4
No No
91) 132
Quick Quick
release
latch
release
same as
Model 1
latch
Same
3410
as
2415 Ta
Models 1,2,3
lS
800
18.75
NRZI
.6
32.0
11. S
Yes
24Q
Quick
release
latch
Same as
3410 plus
Mylar
Units
Models 4,5,6
30
1600
18.75
PE
,.6
32.0
12.8
Yes
240
Quick
release
latch
Same as
3410