Computer Storage

In: Computers and Technology

Submitted By mariahassan
Words 1498
Pages 6
COMPUTER STORAGE
The device, which is used to store data, is called computer storage. We can divide computer storage into following categories. Computer Storage

Permanent

Secondary

Temporary

ROM Optical Disk Magnetic Disk Magnetic Tape RAM Cache

C.D

DVD H.D

F.D

ZIP

Secondary Storage
It is not possible to store large amount of data for future use in primary memory of computer because its size is small and it cannot store data on permanent basis. So it is necessary to use some extra media to store large amount of data. That kind of memory is called secondary storage, auxiliary storage, additional storage, external storage or semi-permanent storage. This memory is cheaper that primary memory due to different storage mechanism. Its speed is also slower than RAM. There are two types of secondary memory.

Sequential Access Storage:
Sequential Access Memory is one in which data is retrieved is in the same sequence in which it is stored.

Direct/Random Access Storage:
Direct Access Storage is one in which data is retrieved directly/randomly without any sequence.

MAGNETIC TAPE
Magnetic tape is one of the oldest & popular devices used for storing data permanently. As its name suggest, this device stores information on a magnetic tape that is made of plastic (Mylar) that is the form of magnetic spots.

Size
The tape ribbon itself is stored in reels of 50 to 2400 feet or small cartridge or cassette.

Quality
It is similar to the tape used on a tape recorder expect that it is higher quality and more durable.

Non-Volatile Nature
By nature it is non-volatile memory. Like recorder tape computer tape can be erased and reused indefinitely. Old data on a tape are automatically erased as new data are recorded in the same area.

Advantages of Magnetic Tape Unlimited storage
The storage capacity of a magnetic tape is virtually unlimited…...

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