Data Units

A Bit is the smallest unit of data in a computer. A bit has a single binary value, either 0 or 1.

A Byte is another data storage unit that is equal to 8 bits.

A Kilobyte is approximately a thousand bytes. ( 1,024 )

• 2 Kilobytes: Typewritten page
• 50 Kilobytes: Image of a document page, compressed
• 100 Kilobytes: Photograph, low-resolution

A Megabyte (MB) is used to describe data storage, 1,048,576 (2 to the 20th power) bytes.

• 1 Megabytes: 3 seconds of DVD-quality video
• 2 Megabytes: Photograph, high resolution
• 500 Megabytes: CD-ROM

A Gigabyte(GB) a unit of information equal to one billion (1,073,741,824) bytes or 1024 megabytes.

• 1 Gigabyte: 100,000 emails
• 50 Gigabytes: Library floor of books on shelves








Page 4 - Memory (External)