Physics for Information Science: Unit III: Magnetic Properties of Materials
Magnetic Hard Disk
Types, Construction, Working Principle, Advantages, Disadvantage
These disks are direct access storage devices. These disks are magnetically coated.There are two types of disks viz.
MAGNETIC
HARD DISK
These
disks are direct access storage devices. These disks are magnetically coated.
There
are two types of disks viz.,
1.
Hard disk 2. Floppy disk.
Let
us discuss about a Hard disk.
Hard Disk: The hard disk is 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, forming a disk pack and it is shown in Fig. 3.37
This
disk pack is placed in a drive mechanism called Hard disk drive. The drive
mechanism drives the disk pack with the spindle. The data is written (or) read
by the R/W heads in the horizontal sensing arms by moving in and out between
the platters with the precaution that the R/W head doesn't touches the surface
instead, it fly over the disk surface by a fraction of a millimetre.
Giant
magneto resistance (GMR) sensors are used now-a-days as sensing element is 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 once corrupted, there is a heavy loss of data.
Note:
The hard disk once installed in the system, cannot be removed easily. Latest
Hard disk drive using GMR sensor as sensing element is discussed later.
Physics for Information Science: Unit III: Magnetic Properties of Materials : Tag: : Types, Construction, Working Principle, Advantages, Disadvantage - Magnetic Hard Disk
Physics for Information Science: Unit III: Magnetic Properties of Materials
Under Subject
Physics for Information Science
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