Hard Disk
Hard disks are commonly used secondary storage device in microcomputers. Hard Disk stores large amount of data,information or programs permanently.since,it is fixed inside the system unit,it is called fixed disk.
It is amagnetic disk type storage device.it consists of one or more metal disks or platter coated with magnetic material.the magnetic disk or platters are mounted with a common spindle. a hard disk may have more than one access Arm(Actuator)depending upon the numbers of platters.there is a Read/Write head on each access Arm to access data from each disk surface.when data has to be accessed ,the spindles rotates,which in turns rotates platters and the R/W head moves inward and outwards to locate the data.these platters and Read/Writeheads are enclosed inside a sealed dust free compartment.since a hard disk has huge storage capacity and it is reaiable and durable,so the hard disk is also used as a back up storage device.
Hard disks are commonly used secondary storage device in microcomputers. Hard Disk stores large amount of data,information or programs permanently.since,it is fixed inside the system unit,it is called fixed disk.
It is amagnetic disk type storage device.it consists of one or more metal disks or platter coated with magnetic material.the magnetic disk or platters are mounted with a common spindle. a hard disk may have more than one access Arm(Actuator)depending upon the numbers of platters.there is a Read/Write head on each access Arm to access data from each disk surface.when data has to be accessed ,the spindles rotates,which in turns rotates platters and the R/W head moves inward and outwards to locate the data.these platters and Read/Writeheads are enclosed inside a sealed dust free compartment.since a hard disk has huge storage capacity and it is reaiable and durable,so the hard disk is also used as a back up storage device.
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