Post By: Hanan Mannan
Contact Number: Pak (+92)-321-59-95-634
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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