SSD – Solid State Drive – a storage medium using NAND (flash) solid state storage as opposed to the mechanically spinning platters in disk drive storage. SSDs, like HDDs, retain their data contents when power is switched off; they are non-volatile. An SSD consists of NAND flash chips and controller running Flash Translation Layer (FTL) software to accept and handle read and write requests from the host system, and also manage the cells in the drive, returning cells with deleted data to use.
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