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.

Different Types Of Raid Storage. For simplicity, the dynamic diagrams show each io as a raid block. The most common types are raid 0.

Data is simply striped across multiple disks for parallel storage and retrieval. It uses two parity stripes that protect the data in the event of two disk failures in the raid set. Raid is available in many different levels.