Secondary Storage Devices Notes. The hard disk platters spin at 5 a high rate of speed, typically 5400 to 7200 revolutions per minute (rpm).storage capacities of hard disks for personal computers range from 10 gb to 120 gb (one billion bytes are called a gigabyte). As (integral or separate) part of an operating system,.
It is large capacities to the tune of terabytes. Various types of secondary storage devices are as followings: Ram (random access memory) and rom (read only memory) are examples of primary storage.
