A solid-state drive (SSD) (also known as a solid-state disk  or electronic disk, though there are no actual "disks" present) is a data storage device that uses integrated circuit assemblies as memory to store data persistently. SSD technology uses electronic interfaces compatible with traditional block input/output (I/O) hard disk drives. SSDs do not employ any moving mechanical components, which distinguishes them from traditional magnetic disks such as hard disk drives (HDDs) or floppy disks, which are electromechanical devices containing spinning disks and movable read/write heads. Compared with electromechanical disks, SSDs are typically less susceptible to physical shock, are much quieter, and have lower access time and latency. However, while the price of SSDs has continued to decline in 2012, SSDs are still about 10 times more expensive per unit of storage than HDDs. Although they are very damage proof, current SSDs have been known to crash on rare occasion.
SSDs share the I/O interface developed for hard disk drives, thus permitting simple replacement for most applications.