File size

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File size measures the size of a computer file. Typically it is measured in bytes with a prefix. The actual amount of disk space consumed by the file is dependent on the file system.

The maximum file size depends on the number of bits reserved to store size information. For instance with FAT32 the size of a file can not exceed 4 GiB.

KB = 1,024 bytes

MB = 1,048,576 bytes ^[1] - but many manufactures report disk capacity using "MB" to mean exactly one million (1,000,000) bytes

GB = 1,073,741,824 bytes ^[2] - but many manufactures report disk capacity using "GB" to mean exactly one billion (1,000,000,000) bytes

TB = 1,099,511, 627,776 bytes ^[3] - but many manufactures report disk capacity using "TB" to mean exactly one trillion (1,000,000,000,000) bytes

^ 2^20 = 1 048 576
^ 2^30 = 1 073 741 824
^ 2^40 = 1 099 511 627 776

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