|
The exabyte is a multiple of the unit byte for digital information. The prefix ''exa'' indicates multiplication by the sixth power of 1000 (1018) in the International System of Units (SI). Therefore, one exabyte is one quintillion bytes (short scale). The symbol for the exabyte is EB. : 1 EB = = = = 1000 petabytes = = . A related unit, the exbibyte, using a binary prefix, is equal to (=, about 15% larger. ==Usage examples and size comparisons== * A processor with a 64-bit address bus can address 16 exbibytes of memory, which is over 18 exabytes. * The world's technological capacity to store information grew from 2.6 ("optimally compressed") exabytes in 1986 to 15.8 in 1993, over 54.5 in 2000, and to 295 (optimally compressed) exabytes in 2007. This is equivalent to less than one CD (650 MB) per person in 1986 (539 MB per person), roughly four in 1993, 12 in 2000, and almost 61 in 2007. Piling up the imagined 404 billion CDs from 2007 would create a stack from the earth to the moon and a quarter of this distance beyond (with 1.2 mm thickness per CD).〔Martin Hilbert and Priscila López, "(The World’s Technological Capacity to Store, Communicate, and Compute Information )", ''Science'', 332(6025), 2011: 60–65; see also ("free access to the study" ) and ("video animation" ).〕 * The world's technological capacity to receive information through one-way broadcast networks was 432 exabytes of information in 1986, 715 exabytes in 1993, 1,200 exabytes in 2000, and 1,900 in 2007 (and with all the preceding examples assuming that those figures represent "optimally compressed" data).〔 * The world's effective capacity to exchange information through two-way telecommunication networks was 0.281 exabytes of information in 1986, 0.471 in 1993, 2.2 in 2000, and 65 exabytes in 2007 (yet again, all such amounts listed are strictly working off the basis that the data was in an "optimally compressed" form).〔 * In 2004, the global monthly Internet traffic passed 1 exabyte for the first time. In January 2007, Bret Swanson of the Discovery Institute coined the term ''exaflood'' for a supposedly impending flood of exabytes that would cause the Internet's congestive collapse. Nevertheless, the global Internet traffic has continued its exponential growth, undisturbed, and it is estimated at 21 exabytes per month.〔(Cisco Systems )〕 * According to the June 2009 Cisco Visual Networking Index IP traffic forecast, global mobile data traffic will grow at a CAGR of 131 percent between 2008 and 2013, reaching over two exabytes per month by 2013.〔(Cisco Visual Networking Index (Cisco VNI) )〕 * According to the 2011 update of Cisco's VNI IP traffic forecast, by 2015, annual global IP traffic will reach 966 exabytes or nearly one full zettabyte. Internet video will account for 61% of total Internet data.〔http://allthingsd.com/20110601/cisco-the-internet-is-like-really-big-and-getting-bigger/〕 * According to the February 2013 update of Cisco VNI Forecast for 2012–17, annual global IP traffic will pass the zettabyte threshold by the end of 2016. In 2016, global IP traffic will reach 1.3 zettabytes per year or 110.3 exabytes per month. By 2017 global mobile data traffic will reach 11.2 exabytes per month (134 exabytes annually); growing 13-fold from 2012 to 2017.〔(Cisco Visual Networking Index: Global Mobile Data Traffic Forecast Update, 2012–2017 )〕〔(The Zettabyte Era - Visual Networking Index (VNI) - Cisco Systems )〕 * The global data volume at the end of 2009 had reached 800 exabytes.〔("Global data volume 2009 reached 800 exabyte" ), ''genevaassociation.org'', May 2010. Retrieved February 16, 2012.〕 * According to an International Data Corporation paper sponsored by EMC Corporation, 161 exabytes of data were created in 2006, "3 million times the amount of information contained in all the books ever written", with the number expected to hit 988 exabytes in 2010. * A gram of DNA theoretically can hold 455 exabytes. * According to the CSIRO, in the next decade, astronomers expect to be processing 10 petabytes of data every hour from the Square Kilometre Array (SKA) telescope. The array is thus expected to generate approximately one exabyte every four days of operation. According to IBM, the new SKA telescope initiative will generate over an exabyte of data every day. IBM is designing hardware to process this information.〔http://www.computerworld.com.au/article/319128/ska_telescope_provide_billion_pcs_worth_processing_updated_/〕 * According to the Digital Britain Report, 494 exabytes of data was transferred across the globe on June 15, 2009.〔()〕 Several filesystems use disk formats that support theoretical volume sizes of several exabytes, including Btrfs, XFS, ZFS, exFAT, NTFS, HFS Plus, and ReFS. * The ext4 file system format supports volumes up to 1.1529215 exabytes in size, although the userspace tools cannot yet administer such filesystems. * Oracle Corporation claimed the first exabyte tape library with the SL8500 and the T10000C tape drive in January 2011.〔()〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Exabyte」の詳細全文を読む スポンサード リンク
|