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IBM 350 RAMAC
(1955) |
IBM 3330
(1970) |
IBM 3380
(1980)
|
IBM 3390
(1989)
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Information Per Volume |
5 million characters |
100 million characters |
630 million characters |
1890 million characters |
Time needed to Access Disks |
600/1,000ths of a second |
30/1,000ths of a second |
16/1,000ths of a second |
12.5/1,000ths of a second |
Read-Write Speed |
9,700 characters a second |
806,000 characters a second |
3 million characters a second |
4.2 million characters a second |
|
Note: A volume measurement is used here for consistency. A volume is the portion of a single unit disk storage accessible to a single read/write mechanism, for example, a head disk assembly, disk pack, actuator or a drum.
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