SSD’s don’t have RPMs - they are Solid State Drives with no moving parts.
This makes access times much quicker than for Hard Disk Drives, since there is no seeking and no rotation going on.
SSD drives are generally not as fast as the fastest HDD drives when it comes to sustained transfer rates, however.
SSDs are also much more expensive than HDD.
Tests show that some real-word tasks perform significantly faster on SSD drives, such as e.g. booting Windows, othe tasks perform the same, and a few tasks perform worse.
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