Based Wikipedia, A solid-state drive (SSD) (sometimes improperly referred to as a “solid-state disk” or “electronic disk”) is a data storage device that uses integrated circuit assemblies as memory to store data persistently.
Yes, SSD disk has no moving parts. It is as quiet as nothing working.
SSDs use NAND flash chips. Within each of these chips are millions of cells. There are only two types of NAND cells today: single-layer (SLC) or multi-layer (MLC).
So, which one is better, SLC or MLC.

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