STK 4305

1978STC 4305

First solid state disk drive.

Why it's important

The last instance of mainframe subsystem performance improvement by dedicated "gap filling" high performance hardware. In this case, the 4305 targeted the fixed head disk drives (i.e., 2305). Subsequent caching in the subsystem eliminated the need for such performance enhancement products.

[As much detailed information as you have about this event]
It is not clear that this is the first solid state disk drive.
At least Alpha Data may have offered such a product in 1977.
It is possible that IBM Defense Systems used IBM Bulk Store as a DASD
Other early defense products may have used core as a disk

Additional Information
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