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XQD card is a memory card format primarily developed for flash memory cards. It uses PCI Express as a data transfer interface. The new format is targeted at high-definition camcorders and high-resolution digital photo cameras. It offers target read and write speeds from 1 Gbit/s (125 Mbyte/s) to about 4 Gbit/s (500 Mbytes/s)〔 and storage capabilities beyond 2 TB. The cards are not backward compatible with CompactFlash or CFast cards. XQD and CFast were both designed as a replacement of the then-16-year-old (in 2010) CompactFlash standard. The format was first announced in November 2010 by SanDisk, Sony and Nikon, and was immediately picked up by the CompactFlash Association for development. The final specification was announced in December 2011. XQD version 2.0 was announced in June 2012, featuring support for PCI Express 3.0 with transfer rates up to 8 Gbit/s (1000 Mbyte/s). ==Availability== In January 2012, the first XQD card was announced by Sony, declaring a 1 Gbit/s read and write speed.〔(【引用サイトリンク】title=Sony Announces World's First XQD Memory Cards )〕〔http://presscentre.sony.co.uk/content/detail.aspx?NewsAreaId=2&ReleaseID=7201〕 In July 2012, Lexar announced plans to support the XQD format.〔(【引用サイトリンク】title=Lexar Announces Support for XQD Memory Card Specification )〕 Currently, Sandisk and Kingston have not announced plans to produce XQD cards〔(【引用サイトリンク】title=Sandisk, Lexar, Kingston not making new XQD cards )〕 Sony has also said their Broadcast Camcorders (XDCAM and XDCAM EX) will support the XQD cards. For their broadcast products the XQD card will be classified as a secondary media as XQD is based around a DSLR consumer technology, however, the cards will support acquisition in the broadcast quality ''MPEG HD422'' 50 Mbit/s. On 4 September 2013, they released the PXW-Z100, a 4K prosumer camera that records onto XQD cards. The Nikon D4 and its successor the Nikon D4s, are the only DSLR cameras to support the XQD format, although a Compact Flash UDMA is also provided (dual slots). 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「XQD card」の詳細全文を読む スポンサード リンク
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