 Flash-based SSDs store data in metal-oxide-semiconductor (MOS) integrated circuit chips which contain non-volatile floating-gate memory cells.Flash memory-based solutions are typically packaged in standard disk drive form factors (1.8-, 2.5-, and 3.5-inch), but also in smaller more compact form factors, such as the M.2 form factor, made possible by the small size of flash memory.Lower-priced drives usually use triple-level cell (TLC) or multi-level cell (MLC) flash memory, which is slower and less reliable than single-level cell (SLC) flash memory.