|IBM 350 RAMAC
|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.