Because RAM can’t store anything without power and we do want to be able to turn off our computer from time to time, we need a storage medium that retains its stored data, even without electricity.
An HDD (which still has mechanically moving parts) is the slowest of the three and will usually read and save Data at about 100 MByte/s.
An SSD will already read and write at around 500 MByte/s, and an NVMe SSD currently reads and writes sequential Data with up to 10000 MBytes/s.
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