UNITS OF STORAGE IN COMPUTER Adetayo Ayodele A.
OBJECTIVES At the end of the lesson, the students should be able to:i. State the various units of storage and their values.ii. Differentiate between kilometer, kilogram and kilobyteiii. Distinguish between kilobyte, megabyte and gigabyte.
Definition of Termsi. Bit: This refers to the smallest unit of information that can be stored in a machine. A single bit can only hold 1 and/ or 0.ii. Nibble: a nibble is a collection of four bits. 3 2 1 0
iii. Bytes: A byte consists of eight bits and is the smallest addressable data item on a microprocessor. The bits in a byte are normally numbered from zero to seven using the convention shown below. 7 6 5 4 3 2 1 0Note: A byte also contains exactly two nibbles.
iv. Word: This is a term for the naturalunit of data used by a particularcomputer design.In a nutshell, word is a group of 16 bits.15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0Note: A word contains exactly two bytes or fournibbles.
v. Double Word: A double word is exactly a pair of word. Therefore, a double word quantity is 32 bits long .• note: double word can be divided into a high order word and low order word or four different bytes or eight different nibbles.