 an SSD as defined) was the 1978 StorageTek STC 4305.The STC 4305, a plug-compatible replacement for the IBM 2305 fixed head disk drive, initially used charge-coupled devices (CCDs) for storage and consequently was reported to be seven times faster than the IBM product at about half the price ($400,000 for 45 MB capacity) It later switched to DRAM.Before the StorageTek SSD there were many DRAM and core (e.g.