Hard Drive

"There are two different definitions of gigabyte in general use:

1,000,000,000 bytes or 10⁹ bytes is the decimal definition, used in telecommunications (such as network speeds) and most computer storage manufacturers (such as hard disks and flash drives). This usage is compatible with SI. Quote from Seagate: "For drive storage capacity, 1 gigabyte = 1,000,000,000 bytes (or one billion bytes).", Similar quotes are found on the websites of other storage manufacturers.
1,073,741,824 bytes, equal to 1024³, or 2³⁰ bytes. This is the definition commonly used for computer memory and file sizes. Microsoft uses this definition to display hard drive sizes,^[ as do most other operating systems and programs by default. By this definition, there are 1,024 times 1,024 times 1,024 bytes (or 1,024 megabytes where one megabyte is considered as 1048576 bytes) in a gigabyte. Since 1999, the IEC recommends that this unit should instead be called a gibibyte (abbreviated GiB). Although there is little other usage of the term "gigabyte" apart from referring to memory, file sizes, or storage capacity, the IEC's recommendations are frequently ignored amongst computer professionals, and "gigabyte" is used colloquially to mean 1024³ bytes. The standard body JEDEC Solid State Technology Association acknowledges the conflict and the existence of the IEC recommendations but, in recognition of the widespread colloquial usage, continues to recognize the definition of 1024³ bytes.^"