Physics for Information Science: Unit III: Magnetic Properties of Materials
Magnetic Storage Devices
Classification, Examples
In general, memory units are the devices used to store the information (Input and output) in the forms of bits [ 8 bit = 1 Byte ].
MAGNETIC
STORAGE DEVICES
In general, memory units are the devices used to store the information (Input and output) 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 datas 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)
auxillary 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.
The
datas in auxillary memory can also be transferred to primary memory (i.e.,) to
computer partially, when required for processing. This can be compared to a
book, from which we can access (or) take copies as we need.
Examples
1.
Magnetic tapes (Cassettes)
2.
Magnetic disk (Floppy and Hard disc)
3.
Magnetic Bubble memories
4.
Magnetic Hard Disk Drive (HDD)
Physics for Information Science: Unit III: Magnetic Properties of Materials : Tag: : Classification, Examples - Magnetic Storage Devices
Physics for Information Science: Unit III: Magnetic Properties of Materials
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Physics for Information Science
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