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What is solid-state drive?

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When we learn about power semiconductor switches and power electronic drives... sometimes people refer them to be solid-state power switches or solid-state drives. What does 'solid-state' mean? And, why it's used here (e.g. solid-state drives)?

Thanks.
 

A solid-state relay (SSR) is a solid state electronic component that provides a similar function to an electromechanical relay but does not have any moving components, increasing long-term reliability. With early SSR's, the tradeoff came from the fact that every transistor has a small voltage drop across it. This collective voltage drop limited the amount of current a given SSR could handle. As transistors improved, higher current SSR's, able to handle 100 to 1,200 amps, have become commercially available.
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Solid state disk (SSD, also called solid state drive) is a data storage device that uses nonvolatile memory such as flash, and volatile memory such as SDRAM, to store data, instead of the spinning platters found in conventional hard disk drives. While not technically "disks" in any sense, these devices are so named because they are typically used as replacements for disk drives in situations where conventional drives are impractical.
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https://en.wikipedia.org/wiki/Solid_state_disk

In general, a solid state device doesn't have moving parts ..

solid-state power switches or solid-state drives
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The word DRIVE is used in data storage systems .. I think what you may have in mind is a solid state device, quite often called solid state relay (or switch - SSS) ..

Regards,
IanP
 

In contrast with conventional hard drive which are rotational mechanical devices, solid state drive uses solid state memories like NAND flashes to store data. There are different types of SDDs are available in the market but they are expensive and mostly are used in high-end servers. It is expected to see SSDs for normal PCs available in the market in next few years time.
 

This is the etymology of the term:
http://en.wikipedia.org/wiki/Solid_state_(electronics)
 

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