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The kilobyte is a multiple of the unit byte for digital information. The International System of Units (SI) defines the prefix kilo as a multiplication factor of 1000 (10 3); therefore, one kilobyte is 1000 bytes. [1] The internationally recommended unit symbol for the kilobyte is kB. [1]
Commonly, a decimal SI metric prefix (such as kilo-) is used with bit and byte to express larger sizes (kilobit, kilobyte). But, this is usually inaccurate since these prefixes are decimal, whereas binary hardware size is usually binary. Customarily, each metric prefix, 1000 n, is used to mean a close approximation of a binary multiple, 1024 n ...
For example, a kilobyte is actually 1024 bytes even though the standard meaning of kilo is 1000. And, mega normally means one million, but in computing is often used to mean 2 20 = 1 048 576 . The table below illustrates the differences between normal metric sizes and the implied actual size – the binary size.
For example, in citations of main memory or RAM capacity, kilobyte, megabyte and gigabyte customarily mean 1024 (2 10), 1 048 576 (2 20) and 1 073 741 824 (2 30) bytes respectively. In the specifications of hard disk drive capacities and network transmission bit rates, decimal prefixes are used. For example, a 500-gigabyte hard drive holds 500 ...
The term is also used in some fields of computer science and information technology to denote 1 073 741 824 (1024 3 or 2 30) bytes, however, particularly for sizes of RAM. Thus, some usage of gigabyte has been ambiguous. To resolve this difficulty, IEC 80000-13 clarifies that a gigabyte (GB) is 10 9 bytes and specifies the term gibibyte (GiB ...
4.8×10 8 bit/s Computer data interfaces USB 2.0 High-Speed (interface signalling rate) 7.86×10 8 bit/s Computer data interfaces FireWire IEEE 1394b-2002 S800 9.5×10 8 bit/s Computer storage Harddrive read, Samsung SpinPoint F1 HD103Uj [7] 10 9: Gbit/s 1×10 9 bit/s Networking Gigabit Ethernet: 1.067×10 9 bit/s Computer data interfaces
8192/1024 kbit/s: 1024/128 kB/s: ... 1000/1000 Mbit/s: ... Some other computer architectures use different modules with a different bus width.
The difference is a direct result of the sizes of the values used to report the amounts of total and unallocated (free) extended memory in 1 KB (1024-byte) units: XMS 2.0 uses 16-bit unsigned integers, capable of representing a maximum of (65535 * 1 KB) = 64 MB, while XMS 3.0 adds new alternate functions that use 32-bit unsigned integers ...
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