艾字节或艾可萨字节(英语:Exabyte,缩写为EB)(又称百京字节),是资讯计量单位字节的多倍形式,通常在标示网络硬碟总容量,或具有大容量的存储介质时使用。国际单位制(SI)以1018来定义前缀艾可萨,故1艾字节表示1018字节[1]。据估算,2011年整个互联网的容量总和不超过525 EB。在1公克DNA中可以储存360 EB的资讯量。
Quick Facts 字节的次方单位, 十进制前缀 (SI) ...
字节的次方单位
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二进制前缀 (IEC 60027-2)
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名字 |
符号 |
倍数
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kibibyte |
KiB |
210
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mebibyte |
MiB |
220
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gibibyte |
GiB |
230
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tebibyte |
TiB |
240
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pebibyte |
PiB |
250
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exbibyte |
EiB |
260
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zebibyte |
ZiB |
270
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yobibyte |
YiB |
280
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Exbibyte是另外一个与其相关的单位,使用二进制前缀,等于10246 (=260)个字节。一个exbibyte大约比一个艾字节大了15%。常与艾字节混淆。
- 1 EB = 1,000 PB
- 1 EB = 1,000,000 (106) TB
- 1 EB = 1,000,000,000 (109) GB
- 1 EB = 1,000,000,000,000 (1012) MB
- 1 EB = 1,000,000,000,000,000 (1015) KB
- 1 EB = 1,000,000,000,000,000,000 (1018) B
另外,艾字节往往亦可以指Exbibyte,其换算公式是:
- 1 EB ≈ 0.867 EiB
- 1 EiB = 1,024 PiB
- 1 EiB = 1,048,576 (10242) TiB
- 1 EiB = 1,073,741,824 (10243) GiB
- 1 EiB = 1,099,511,627,776 (10244) MiB
- 1 EiB = 1,125,899,906,842,624 (10245) KiB
- 1 EiB = 1,152,921,504,606,846,976 (10246) B
International Standard ISO/IEC 80000 Quantities and Units – Part 13: Information science and technology, International Electrotechnical Commission (2008).