HARD DISK:



The hard disk made of hard aluminium platters. The platter surface is carefully machined until it is flat (or) plane. The platter surface is coated with magnetic material (magnetic oxides). The platter is built into a box. 





















Similar such disks are mounted on a vertical shaft, formatting a disk pack and it is shown in fig. this disk pack is placed in a drive mechanism called Hard disk drive.

Advantages:

1.    It has very large storage capacity.

2.    Thousands of files can be permanently stored.

3.    Very high speed in reading and writing the informations.

4.    This is prevented from dust particles, since they are  seated in special chamber

Disadvantages:

1.    It is very costly.

2.    If data is one corrupted, there is a heavy loss of data
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