Volatile memory is memory that loses its data if power is not maintained, in contrast to non-volatile memory (NVM). Usually such memory is used on a SSD as microcontroller cache and for metadata storage, metadata being “data about data.” In lieu of external memory for the latter, modern NVMe SSDs can utilize some of the host system’s memory instead.
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- SRAM
- DRAM
- Host Memory Buffer (HMB)