A hard disk drive
Alisa wrote:Magnetic disk and Hard Disk, these two devices are used to store the data in Computer System.
contains one or more magnetic disks - they're not two separate types of device (though there are other things that contain a magnetic disk e.g. a floppy disk). What is it that you actually want to compare?
Alisa wrote:Which Device is better...
The answer to this kind of question will almost always depend on what you want to do, how much you're prepared to spend etc.