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CompactFlash (CF) is a flash memory mass storage device used mainly in portable electronic devices. The format was specified and the devices were first manufactured by SanDisk in 1994.〔(Digiprint Uk )〕 CompactFlash became the most successful of the early memory card formats, surpassing Miniature Card and SmartMedia. Subsequent formats, such as MMC/SD, various Memory Stick formats, and xD-Picture Card offered stiff competition. Most of these cards are smaller than CompactFlash while offering comparable capacity and speed. Proprietary memory card formats for use in professional audio and video, such as P2 and SxS, are faster, but physically larger and more costly. CompactFlash remains popular and is supported by many professional devices and high end consumer devices. As of 2014, both Canon and Nikon use CompactFlash for their flagship digital still cameras. Canon also chose CompactFlash as the recording medium for its professional high-definition tapeless video cameras.〔(File-based video recording onto CF cards: features and benefits, by Canon Inc. )〕 Ikegami professional video cameras can record digital video onto CompactFlash cards through an adaptor.〔(Ikegami at Government Video EXPO 2010, press-release by Ikegami Ltd. )〕 In 2008, a variant of CompactFlash, CFast was announced. CFast (also known as CompactFast) is based on the Serial ATA interface rather than the Parallel ATA interface used by the original CompactFlash cards. In November 2010, Sandisk, Sony, and Nikon presented a next generation card format to the CompactFlash Association. The new format has a similar form factor to CF/CFast but is based on the PCI Express interface instead of Parallel ATA or Serial ATA.〔(Engadget: Sandisk, Sony, and Nikon propose 500MBps memory card with more than 2TB capacity )〕〔(CNET: CompactFlash allies rally against dominant SD )〕 With potential read and write speeds of 1 Gbit/s (125 MByte/s) and storage capabilities beyond 2 TiB the new format is aimed at high-definition camcorders and high-resolution digital cameras, but the new cards are not backward compatible with either CompactFlash or CFast. The XQD card format was officially announced by the CompactFlash Association in December 2011.〔(Engadget: CompactFlash Association readies next-gen XQD format, promises write speeds of 125 MB/s and up )〕 ==Description== There are two main subdivisions of CF cards, 3.3 mm thick type I and 5 mm thick type II (CF2). The type II slot is used by miniature hard drives and some other devices, such as the Hasselblad CFV Digital Back for the Hasselblad series of medium format cameras. There are four main card speeds: original CF, CF High Speed (using CF+/CF2.0), faster CF 3.0 standard, yet faster CF 4.0 standard adopted as of 2007. CompactFlash was originally built around Intel's NOR-based flash memory, but has switched to NAND technology.〔http://www.karlfoster.com/text/DP_flashmemory.doc〕 CF is among the oldest and most successful formats, and has held a niche in the professional camera market especially well. It has benefited from both a better cost to memory-size ratio and, for much of the format's life, generally greater available capacity than other formats. CF cards can be used directly in a PC Card slot with a plug adapter, used as an ATA (IDE) or PCMCIA storage device with a passive adapter or with a reader, or attached to other types of ports such as USB or FireWire. As some newer card types are smaller, they can be used directly in a CF card slot with an adapter. Formats that can be used this way include SD/MMC, Memory Stick Duo, xD-Picture Card in a Type I slot, and SmartMedia in a Type II slot, as of 2005. Some multi-card readers use CF for I/O as well. 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「CompactFlash」の詳細全文を読む スポンサード リンク
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