Secondry Storage: Optical, Magnetic and Solid State

Magnetic Storage:

Magnetic storage is used in hard disc drives (HDDs) and digital tape drives which are often used for backing up large computer systems. Magnetic discs consist of stacks of non-removable discs coated with magnetic materials. Data is encoded as opposing magnetic polarities on the surface of the disc. Electromagnetics in the read/write heads read and write the data. The cost of magnetic storage is very low. Hard disc drives in budget laptops have capacities of at least 1 terabyte.

Optical Storage:

Optical storage includes:                                                                                

• compact discs (CDs) that store 700MB
• digital versatile discs (DVDs…