Application of Magnetic Principles and Materials in Computer Storage Devices.



In general, memory units are the devices used to store the information (Input and out put) in the forms of bits[8 bit= 1 byte].

The memory units are mainly classified into two categories.

1.    Main memory (primary) or Internal Memory

2.    Auxillary memory (secondary) (or) External Memory
Main memory

        The memory unit of the Central Processing Unit (CPU) is called as main memory. We can compare a black board to main memory. Here we can write so many data on the memories and finally can be erased, if we need to erase it.

Examples: RAM, ROM, EPROM, etc.

Auxillary memory
   
        Since the storage capacity of the primary memories are not sufficient, secondary (or) auxilliary memory units are developed to store the large volume of data, separately and hence called as extra (or) additional (or) external memory.

    This type of memory is also referred to as back-up storages because; it is used to store large volume of data on a permanent basis .

Examples;

1.    Floppy and hard disk
2.    Magnetic tapes
3.    Magnetic bubble memories
4.    cassettes etc.
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