COMPUTER - MEMORY UNITS
- It is the amount of data that can be stored in the storage unit.
- The storage capacity are expressed in terms of Bytes.
Following are the main memory storage
units:
|
Sr. No.
|
Unit
|
Description
|
|
1
|
Bit (Binary Digit)
|
A binary digit is logical 0 & 1
representing a passive or an active state of a component in an electric
circuit.
|
|
2
|
Nibble
|
A group of 4 bits is called nibble.
|
|
3
|
Byte
|
A group of 8 bits is called byte. A
byte is the smallest unit, which can represent a data item or a character.
|
|
4
|
Word
|
A computer word like a byte, is a
group of fixed number of bits processed as a unit which varies from computer
to computer but is fixed for each computer.
The length of a computer word is called word-size or word length and it may be as small as 8 bits or may be as long as 96 bits. A computer stores the information in the form of the computer words. |
Few higher storage units are the
following:
|
Sr. No.
|
Unit
|
Description
|
|
1
|
Kilobyte (KB)
|
1 KB = 1024 Bytes
|
|
1
|
Megabyte (MB)
|
1 MB = 1024 KB
|
|
1
|
GigaByte (GB)
|
1 GB = 1024 MB
|
|
1
|
TeraByte (TB)
|
1 TB = 1024 GB
|
|
1
|
PetaByte (PB)
|
1 PB = 1024 TB
|
