Saturday, 11 February 2012

Magnetic Disk


Dear Member,
     This is our first post related to Storage Devices Session...
In this post we tell you about the knowledge of Magnetic Disk and its importance...

SO FRIENDS LETS START OUR LESSON
  • Magnetic Disk :-

               A memory device, such as floppy disk, or a removable cartridge, that is covered with a magnetic coating on which digital information is stored in the form of microscopically small, magnetic needles. The disk surface is divided into concentric tracks (circles within circles). The thinner the tracks, the more storage. The data bits are recorded as tiny magnetic spots on the tracks. 
The smaller the spot, the more bits per inch and greater the storage. Tracks are further divided into sectors, which hold a block of data that is read or written at one time; for example, READ SECTOR 782, WRITE SECTOR 5448.
 In order to update the disk, one or more sectors are read into the computer, changed and written back to disk. The operating system figures out how to fit data into these fixed spaces.
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