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file size
File size measures the size of a computer file. Typically it is measured in bytes or bits. The actual amount of disk space consumed by the file depends on the file system. The maximum file size a file system supports depends on the number of bits reserved to store size information and the total size of the file system.
Binary prefixes for powers of 210 (1024) and decimal prefixs for powers of 103 (1000) are both in use. The International System of Quantities also allows unambiguous binary prefixes using different names based on an IEC standard, e.g., kibibyte KiB, mebibyte MiB. The traditional KB is usually binary, meaning 1024 bytes, while the corresponding decimal kB for 1000 bytes uses a lower case k for kilo.
With typical disk sector sizes of 512, 1024, 2048, or 4096 bytes decimal prefixes and/or bits are less suited to describe file systems accurately, e.g., the maximal file size on FAT32 is 4 GB−1 B for a binary prefix of bytes, corresponding to 4×1024×1024×1024−1; decimal 4,294,967,295; hexadecimal FFFFFFFF; or binary 11111111111111111111111111111111 in 32 bits.
== References ==
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抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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