The computer industry uses terms such as
megabyte and
gigabyte and corresponding abbreviations
MB and
GB as a measure of information, memory/storage capacity, or computer speed. Here is a list of the names and their numerical equivalents:
KB = Kilobyte (1000
1, a thousand bytes)
MB = Megabyte (1000
2, a million bytes)
GB = Gigabyte (1000
3, a billion bytes)
TB = Terabyte (1000
4, a trillion bytes)
PB = Petabyte (1000
5, a quadrillion bytes)
EB = Exabyte (1000
6, a quintillion bytes)
ZB = Zettabyte (1000
7, a sextillion bytes)
YB = Yottabyte (1000
8, a septillion bytes)
Hence, a "500 gigabyte" hard drive holds 500,000,000,000 (500 billion) bytes.
Note: The precise binary equivalent of all the above numbers is actually 1,024 rather than 1,000. Therefore, a Megabyte is actually 1024
2, or 1,048,576 bytes.