Therefore, I can read it as to retrieve the mail from the disk, can delete it as to erase the mail from the disk. Magnetic storage comes with different medium, tape, disk and mag card. Magnetic tape is the first erasable storage used for computers. It is not that different from that of ordinary music tape or cassette in its look and method of storing data. The most popular storage device is a magnetic disk because it is reliable, has more speed, provides random access, and stores a large amount of data.
Magnetic disk comes in the form of a hard disk and floppy diskette.
A hard disk is a rigid round platter, coated with metal oxide, fixed on a spindle that rotates it approximately 3,600 rpm and above, and bundled with a header that reads and write a data on the surface of the platter. A floppy diskette is mostly made of a polyurethane materials, coated with metal oxide, covered with a jacket that protects it from dust other particles. The best way to imagine a magnetic disk would be to picture an album and a record player. When you place an album and turn on the record player, the albums rotates around while the header is hanging above the surface creating contact. Now, assuming everything else is OK, music comes out of the speaker.