Transfer performance refers to how quickly the disk transfers
data from the disk to memory. One way disk manufacturers improve transfer
performance is to increase the speed at which the disk spins, which makes data
available more quickly to the read/write heads. Another way is to improve the
spacing of data on the disk so that the heads can retrieve several blocks of
data on each revolution. Another way to improve hard disk performance is with a
type of cache memory called disk cache. A disk cache is a type of RAM that
stores the program instruction and data you are working with. When the CPU
needs to get information, it looks in the disk cache first. If it doesn’t find
the information it needs, it retrieves the information from the hard disk.
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