The evolution of hard disk drives

The IBM 1301 Removable Storage Unit

The drive system, which shrunk storage technology from the size of a refrigerator to the size of a washing machine, had six 14-inch platters and contained a removable disk pack that had a maximum capacity of 2.6MB of data. The 1301 lived on through the mid-1970s.

The 1301 had 13 times the capacity of the RAMAC.

Photo courtesy of IBM Archives.

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