1024 megabytes, or 1,048,576 kilobytes, or 1.073741e+09 bytes. A measurement of computer storage. Hard drive manufacturers have defined a gigabyte as exactly 1,000,000,000 bytes in order to make their drives seem larger. This is called marketing

Editorial note. No longer correct: a gigabyte (1 GB) is 10^9 bytes, a gibibyte (1 GiB) is 2^30 bytes. See prefixes for binary multiples.