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Physical Characteristics
| Model |
AO4
AA4
BO4 |
D |
E |
CJ2 |
J |
K |
| Actuators per unit |
4 |
4 |
4 |
2 |
4 |
4 |
| Data cylinders per device |
885 |
885 |
1770 |
885 |
885 |
2655 |
Data tracks
per device |
13,275 |
13,275 |
26,550 |
13,275 |
13,275 |
39,825 |
Alternate
data tracks
per device |
15 |
15 |
15 |
15 |
15 |
15 |
| Bytes per track |
47,476 |
47,476 |
47,476 |
47,476 |
47,476 |
47,476 |
| Bytes per cylinder |
712,140 |
712,140 |
712,140 |
712,140 |
712,140 |
712,140 |
| Gigabytes per device |
.630 |
.630 |
1.260 |
.630 |
.630 |
1.890 |
Gigabytes
per unit (box) |
2.520 |
2.520 |
5.041 |
1.260 |
2.520 |
7.562 |
|
Performance Characteristics (in milliseconds)
| Model |
AO4
AA4
BO4 |
D |
E |
CJ2 |
J |
K |
| Min. seek time
[single cylinder in
milliseconds (ms)] |
3 |
3 |
3 |
2 |
2 |
2 |
| Average seek time |
16 |
15 |
17 |
12 |
12 |
16 |
| Max. seek time |
30 |
28 |
31 |
21 |
21 |
29 |
| Full track rotation
time |
16.6 |
16.6 |
16.6 |
16.6 |
16.6 |
16.6 |
Average rotational
delay |
8.3 |
8.3 |
8.3 |
8.3 |
8.3 |
8.3 |
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