MAGNETIC DISK
· Primary computer storage device.
· One or more platters in the form of disks covered with magnetic media.
· Each disk platter has a flat circular shape.
· Each platter has two working surfaces that stores data.
· Digital information is stored on magnetic disks in the form of microscopically small, magnetized needles.
· Data is stored on either or both surfaces of discs in concentric rings called tracks.
· Each track is divided into a number of sectors.
· To read information, the arm is positioned over the correct track.
· Data is read and written by a disk drive which rotates the discs and positions the read/write heads over the desired track.
WRITE MECHANISM
-> Writes binary data by magnetizing small areas or
zones of the disk.
-> Current through the coil produces magnetic field.
-> Corresponding magnetic pattern is recorded on the
surface.
READ MECHANISM
->It reads data by detecting current pulses induced in
a coil.
->Bits could be read back as a time sequence of pulse
(one) or no pulse (zero).
Physical Characteristics of Disk
HI FRIENDS I AM DHANESH. I ADD THIS BLOG FOR AN EDUCATION PURPOSE