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When b is 2, the unit is the shannon, equal to the information content of one "bit". A system with 8 possible states, for example, can store up to log 2 8 = 3 bits of information. Other units that have been named include: Base b = 3 the unit is called "trit", and is equal to log 2 3 (≈ 1.585) bits. [3] Base b = 10
Definition of prefixes using powers of 10—in which 1 kilobyte (symbol kB) is defined to equal 1,000 bytes—is recommended by the International Electrotechnical Commission (IEC). [28] The IEC standard defines eight such multiples, up to 1 yottabyte (YB), equal to 1000 8 bytes. [29]
This discrepancy causes confusion, as a disk with an advertised capacity of, for example, 400 GB (meaning 400 000 000 000 bytes, equal to 372 GiB) might be reported by the operating system as "372 GB". For RAM, the JEDEC memory standards use IEEE 100 nomenclature which quote the gigabyte as 1 073 741 824 bytes (2 30 bytes). [11]
The storage limit using the 48-bit LBA ATA-6 standard introduced in 2002. 1.6 × 10 18 bits (200 petabytes) – total amount of printed material in the world [citation needed] 2 × 10 18 bits (250 petabytes) – storage space at Facebook data warehouse as of June 2013, [11] growing at a rate of 15 PB/month. [12] 2 61: 2,305,843,009,213,693,952 ...
The tenth power of 2 (2 10) has the value 1024, which is close to 1000. This has prompted the use of the metric prefixes kilo, mega, and giga to also denote the powers of 1024 which is common in information technology with the unit of digital information, the byte. Units of information are not covered in the International System of Units.
A yottabyte (YB) is 1000 8 bytes. Yottabyte may also refer to: Yottabyte, 1024 8 bytes, also called "yobibyte" (YiB) Yottabyte (song), a song by Martin Garrix;
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NOTE 1 Contrast with the SI prefix mega (M) equal to 10 6, as in a 1-Mb/s data transfer rate, which is equal to 1 000 000 bits per second. NOTE 2 The definitions of kilo, giga, and mega based on powers of two are included only to reflect common usage.