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A solid-state drive (SSD) is a data storage device that uses solid-state storage to store persistent data with the intention of providing access in the same manner of a traditional block I/O hard disk drive. SSDs are distinguished from traditional hard disk drives (HDDs), which are electromechanical devices containing spinning disks and movable read/write heads. SSDs, in contrast, use microchips which retain data in non-volatile memory chips and contain no moving parts. Compared to electromechanical HDDs, SSDs are typically less susceptible to physical shock, are silent, and have lower access time and latency. SSDs use the same interface as hard disk drives, thus easily replacing them in most applications.

Source: http://en.wikipedia.org/wiki/Solid-state_drive

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