Magnetic Disk Memory

Magnetic Disk is type of secondary memory which is a flat disc covered with magnetic coating to hold information. It is used to store various programs and files. The polarized information in one direction is represented by 1, and vice versa. The direction is indicated by 0.

Magnetic disk are less expensive than RAM and can store large amounts of data, but data access rate is slower than main memory because of secondary memory. Data can be modified or can be deleted easily in the magnetic disk memory. It also allows random access of data.

Figure – Magnetic Disk

These are various advantages and disadvantages of magnetic disk memory.

Advantages :-
These are economical memory
The easy and direct access of data possible.
It can store large amounts of data.
It has better data transfer rate than magnetic tapes.
It has less prone to corruption of data as compared to tapes.

Disadvantages :-
These are less less expensive than RAM but more expensive than magnetic tape memories.
It need clean and dust free environment to store.
These are not suitable for sequential access.

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