(Solid State Drive) An all-electronic, non-volatile random access storage drive. SSDs are the internal storage in smartphones and tablets and are increasingly used instead of hard drives in desktop and laptop computers. Introduced in the late 1990s, SSDs are faster than hard drives because there is no moving read/write head (zero latency).
Comprising NAND flash memory chips, SSDs are available in multi-terabyte capacities. Although more expensive than hard disks, they are generally more reliable and offer greater protection in hostile environments. In addition, SSDs use less power and are not affected by magnets. See flash memory.
Much More Complex Than Hard Drives
Flash memory does wear out, and SSDs distribute the writes evenly to all the sectors. A great amount of storage management takes place within the drive itself to ensure that sectors are not erased and written too many times.