1. A unit of computer memory or data storage capacity equal to 614.4 megabytes or 3/5ths of a gigabyte.
2. Six hundred billion bytes.
A file size of 1 niggabyte can also be expressed as:
629146 kilobytes (abbreviated as KB or Kb*)
614.4 megabytes (abbreviated as M or MB)
0.60000 gigabytes (abbreviated as G or GB)