solid state

An electronic component or circuit made of solid materials, such as transistors, chips and bubble memory. There is no mechanical action in a solid state device, although an unbelievable amount of electromagnetic action takes place within.

Faster and More Reliable
For data storage, solid state devices are much faster and more reliable than mechanical drives that spin disk platters and tape reels, but they are more expensive. Although solid state costs continually drop, magnetic disks and optical discs also continue to improve their cost/performance ratio.

The first solid state device was the "cat's whisker" of the 1930s. A whisker-like wire was moved around on a solid crystal in order to detect a radio signal.

Solid State Logic in the Mid-1960s

The three transistors in this solid state module (top removed) used in IBM's System/360 computers were advanced technology in the mid-1960s. (Image courtesy of International Business Machines Corporation. Unauthorized use not permitted.)

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(electronics)

solid state - (Often hyphenated when used as an adjective) A term describing any device that uses semiconductor components rather than electron tubes or relays. Semiconductors are "solid" in that they contain no gas ("vacuum" tubes contain a small amount as the vacuum is not perfect) or moving parts (like relays), but probably more important is the connotation of reliability and durability that made possible things like portable radios.