Exabyte
Fra Wikipedia, den frie encyklopedi
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|---|---|---|---|---|
| SI-prefikser | binærprefikser (IEC 60027-2) |
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| Navn (Symbol) |
Vanlig bruk |
Standard SI |
Navn (Symbol) |
Verdi |
| kilobyte (kB) | 210 | 103 | kibibyte (KiB) | 210 |
| megabyte (MB) | 220 | 106 | mebibyte (MiB) | 220 |
| gigabyte (GB) | 230 | 109 | gibibyte (GiB) | 230 |
| terabyte (TB) | 240 | 1012 | tebibyte (TiB) | 240 |
| petabyte (PB) | 250 | 1015 | pebibyte (PiB) | 250 |
| exabyte (EB) | 260 | 1018 | exbibyte (EiB) | 260 |
| zettabyte (ZB) | 270 | 1021 | zebibyte (ZiB) | 270 |
| yottabyte (YB) | 280 | 1024 | yobibyte (YiB) | 280 |
En exabyte (utledet fra SI-prefikset exa-) er en informasjonsstørrelse ca. lik en quintillion bytes. Størrelsen forkortes vanligvis EB.
På grunn av uregelmessigheter ved bruk av binærprefikser i definisjon og bruk, kan det eksakte tallet i vanlig bruk enten være et av de to følgende:
- 1 000 000 000 000 000 000 bytes – 10006 eller 1018.
- 1 152 921 504 606 846 976 bytes – 10246 eller 260.
Because of these irregularities, the term "exbibyte" has been proposed as an unambiguous reference to the latter value. (See binary prefixes.)
As of 2006, exabytes of data are almost never encountered in any practical context. For example, the total amount of printed material in the world is estimated to be around five exabytes. However, one may hear of 16 or 18 exabytes of address space when discussing 64-bit architectures.
It was estimated that by the end of 1999, the sum of human-produced media (including all audio, video recordings and text/books) was about 12 exabytes.[1]
Research at the UC Berkeley School of Information suggests that 5 exabytes of storage space was created in 2002 alone, 92% of it on magnetic media, mostly on hard disks.[2] However, the vast majority of this space is used to store redundant intellectual works such as music and commercial video.
It is claimed that 5 exabytes of data approximately equals "all words ever spoken by human beings."[2][3][4] The 2003 University of California Berkeley report, often cited as the source of this statement, itself cites the website of Caltech researcher Roy Williams where the statement can be found as early as May, 1999.[5] The validity of this estimate is disputed.[6][7]
Since the data count of human vocals is several exabytes,Mal:Fact some people measure that by merging average values, which can have some inaccuracy; thus some would argue that all words spoken by humans would be closer to 1 yottabyte.Mal:Fact
[rediger] Se også
- exabit
- exbibyte
- orders of magnitude (data)
- eByte refere to a multimedia web based learning object used in conjunction with neXus and Vertium
[rediger] Referanser
- ^ http://www.cio.com/archive/092203/enriquez.html, accessed 07-19-2006.
- ^ 2,0 2,1 http://www.sims.berkeley.edu:8000/research/projects/how-much-info-2003/execsum.htm, accessed 07-19-2006.
- ^ http://searchstorage.techtarget.com/sDefinition/0,,sid5_gci944596,00.html, accessed 07-19-2006.
- ^ http://www.itap.purdue.edu/newsroom/news.cfm?NewsID=488, accessed 07-19-2006.
- ^ Archive.org archive (May 8, 1999) of: http://www.ccsf.caltech.edu/~roy/dataquan/, accessed 07-19-2006.
- ^ http://itre.cis.upenn.edu/~myl/languagelog/archives/000110.html, accessed 07-19-2006.
- ^ http://brian.carnell.com/archives/years/2003/12/000022.html, accessed 07-19-2006.
