Magnetic Disk-(Malaya)

                                        Magnetic Disk

Floppy Disk:

·        It is also called as Disk or Diskette.

·        It is a non-volatile and permanent type of storage device.

·        It is a removable storage device remove from the floppy disk drive.

·        It is used to store small amount of data and its speed or access time is very slow.

·        It is consisting of round shape disk plate made up of plastic and coated with metal oxide.

·        The disk in flexible in nature so it is called floppy disk. Present inside the floppy disk cover.

·        It is use for backup of any important information from the hard disk in a floppy disk.

·        If the hard disk is fails or infected with the virus, then the floppy disk is used to store and move the data easily from the computer to another computer.

·        The floppy is available in the market several sizes 3.5 inch, 5.25 inch, 8 inch.

·        Sizes              Capacity
3.5”                1.44 MB
5.25”             1.2 MB
8”                    80 KB – 242 KB

How to Protect a Floppy Disk?

·        Avoid the binding of floppy disk.

·        Insert the disk in to the floppy disk drive carefully with posted level.

·        Do not touch the area of the disk view through an envelope with the window.

·         Do not expose the floppy disk to sun light, high temperature and strong magnetic field.

Hard Disk:

i.        It is a digital storage device used for store a large amount of data for future used.

ii.      It is a non-volatile memory because it stores the data and information permanently.

iii.   The hard disk is used as a secondary memory in the computer system.

iv.    In the hard disk retrieve the data is very fast.

v.      It is used to store up to 1 TB or more.

vi.    The data and information store in hard disk in the form of magnetic that is 0_s and 1_s. so it is called magnetic disk.

vii. All the programs and software installed in the hard disk.

Structure of Hard Disk:

i.        It is consisting of a spindle or central shaft that hold a group of disk or platters with a dust proof and air tight case or cover.

ii.      Each platter consists of two surface that is upper surface and lower surface used for storing recorded data.

iii.   Each platter requires two read and write head and this read and write head used to read and write the information from platters.

iv.    The distance between two platters half inch (1/2).

v.      All the read and write heads are attach to a single access arm so they cannot move independently.

vi.    When the spindle or central shaft rotates then the all platters are rotate in one direction and same speed.

vii. The platter is divide in to invisible concentric circle that is called track and this track in numbered from the outside of the platter starting of the zero.

viii.                             The track is again divide in the pie shaped section that is called sectors.

ix.    The group of same number tracks in different platters is called as cylinder.

x.      The size of the sectors vey in size but they store same amount of data in each sectors.

Latency Time: -it is the time taken to reach the particular track of a Hard Disk.

Seek Time: - it is the time taken to read the record on a hard disk (track).

Access Time: - it is the sum of latency time and seek time.

It is the time taken by read and write head to read and write the record from a hard disk.