write a short note on hard disk .
Hard disk is a type of
magnetic disk .A hard disk consists of several circular disks called
platters . The platters are used to store data .A platter in a hard disk
is coated with a magnetic material. The hard disk in most personal
computers fixed inside the system unit .
Characteristics of hard disk .
. hard disk provides large storage capacity . the capacity of
computer hard disk is 1500 GB and more .
. It is much faster than floppy disks .
. It is the primary media for storing data and programs .
. It is more reliable than floppy disk .
. Data stored on hard disk is faster than floppy disk.
parts
. Hard disk contains one or more metal plats coated with iron oxide .
. It is usually fixed and not portable .
. It is more expensive than diskette .
. It can store large amount of data .
. Its data access speed is faster than diskette .
. It can not be damaged easily due to dust and heat .
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