Hard Disk Drives

Hard disk drives are non volatile devices.A hard disk is a device which is permanently fixed in to the computer.IBM had developed the idea of the Hard Disk.An hard disk consists of following things, a platter, read n write head,spindle motor etc. An hard disk records the data on the platter which looks like the CD but unlike CDs it uses magnetism to store the data.The platter rotates at a very high Speed of 7200rpm with the help of Spindle motor and the read/write head writes or read the data in the form of 0's and 1's from the platter. The video below explains the concept.






Advantages:
a) Hard disk provides information at a very fast rate compared to the floppy disks
b) Since now a days portable external hard disks are available, so it has becomes easy to store a backup of large size of data.


Disadvantages:
a) Though Hard disks are reliable enough sometimes they can even crash due to mechanical failure or crash.
b) Hard disks are bulky enough compared to other devices such as pendrives etc.