What are the fundamental differences between cache memory (as found in a CPU) and cache memory found in a hard disk drive?

What will be an ideal response?

Memory cache is a vital part of a modern computer because of the great disparity between processor speed
and main store (DRAM) speed.
Disk cache is random access memory that is incorporated in hard disk drives to improve their performance by
caching data. It can speed up the access time when making disk transfers. However, it is far less important than
the cache used by the computer, largely because the computer spends relatively little time reading from disk.