A solid-state drive (SSD) is a data storage device that uses solid-state memory to store constant data. Unlike flash-based memory cards and USB flash drives, a SSD emulates a hard disk drive interface, thus easily replacing it in the majority applications. An SSD using SRAM or DRAM (instead of flash memory) is frequently called a RAM-drive.
The unique usage of the term solid-state (from solid-state physics) refers to the employ of semiconductor devices quite than electron tubes, but has in this background been adopted to differentiate solid-state electronics from electromechanical devices as well. With no moving parts, solid-state drives are intrinsically less fragile than hard disks and so also silent (unless a cooling fan is used); as there are no mechanical delays, they typically enjoy low access time and latency.
SSDs have begun to appear in laptops, although they are at present considerably more expensive per unit of capacity than hard drives.
The unique usage of the term solid-state (from solid-state physics) refers to the employ of semiconductor devices quite than electron tubes, but has in this background been adopted to differentiate solid-state electronics from electromechanical devices as well. With no moving parts, solid-state drives are intrinsically less fragile than hard disks and so also silent (unless a cooling fan is used); as there are no mechanical delays, they typically enjoy low access time and latency.
SSDs have begun to appear in laptops, although they are at present considerably more expensive per unit of capacity than hard drives.
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