| |
|
|
|
| |
Data Rate
| Tape
System |
Data
Rate |
|
Model
|
Year
|
(in/sec)
|
(Charac./in.)
|
(Charac./sec.)
|
|
726
|
1953
|
75
|
100
|
7,500
|
|
727
|
1955
|
75
|
200
|
15,000
|
|
729-III
|
1958
|
112.5
|
556
|
62,550
|
|
729-VI
|
1962
|
112.5
|
800
|
90,000
|
|
2401-6
|
1966
|
112.5
|
1,600
|
180,000
|
|
3420-7
|
1971
|
200
|
1,600
|
320,000
|
|
3420-8
|
1973
|
200
|
6,250
|
1,250,000
|
|
Effective Acceleration
|
Tape
System Model
|
Year
|
Terminal
velocity (in/s.)
|
Effective
acceleration (G)
|
Actuator
|
|
726
|
1953
|
75
|
25
|
Moving
coil and 4-bar linkage
|
|
729-I
|
1957
|
112.5
|
55
|
Prolay
and pinch roller
|
|
729-III
|
1958
|
112.5
|
62
|
Prolay
and pinch roller
|
|
2420-7
|
1965
|
200
|
400
|
Low-inertia
motor with capstan as an extension of the
amarture
|
|
3420-8
|
1973
|
200
|
520
|
|
Characters Per Dollars of Monthly Rental
| Tape
System |
Performance |
|
726
|
17.6
|
|
727
|
27.3
|
|
729-III
|
69.5
|
|
729-IV
|
94.8
|
|
2401-6
|
216
|
|
2420-7
|
304
|
|
3420-7
|
478
|
|
3420-8
|
1,440
|
|
* J. P. Harris, W. B. Phillips, J.
F. Wells and W. D. Winger, "Innovations in the Design
of Magnetic Tape Subsystems," IBM Journal of
Research and Development, Vol. 25, No. 5, September
1981, pp. 694, 697 and 698. |
|
| |
|
|
|
