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A flash memory format introduced in 1994 by SanDisk. At approximately 36x43x3mm, CompactFlash (CF) cards are much larger than the SD Cards used in most cameras; however, they are still used in digital SLRs, and many photographers find the larger size harder to misplace. CompactFlash supports both 3.3v and 5v circuits and can hold up to 512GB as of 2015.

Data transfer speeds are designated as multiples of the first CD-ROM rate of 150 KB/sec. For example, 1,000x = 150 MB/sec. See CD-ROM drives.

CF Cards Use the PC Card Interface
Type I CF cards are 3.3mm thick and commonly used for camera storage. Type II cards are 5mm thick and were previously used for miniature hard drives, modems and Ethernet. On earlier laptops, adapters enabled the 50-pin Type II CF card to plug into the 68-pin PC Card slot. See Microdrive and PC Card.

CompactFlash Module
CompactFlash modules are still used in digital SLR cameras with capacities up to 512GB. For form factor comparisons, see memory card.
References in periodicals archive ?
Kingston's CompactFlash Ultimate cards are 100 percent tested and backed by a lifetime hardware warranty and 24/7 live technical support.
CompactFlash card slots are in over 325 digital cameras, over 150 handheld/palm-size PCs and over 410 other electronic platforms including heart monitors, defibrillators, printers, MP3 players, voice recorders, embedded computers, etc.
Chuang explained that with SanDisk high-performance CompactFlash cards currently reaching 8 gigabytes(1) in capacity -- and with higher capacities expected in the near future -- flash memory cards "now have enough capacity to make them a viable alternative to the use of hard disk drives in professional camcorders.
Lexar will display its new 8GB CompactFlash card along with its full line of professional photography products at PMA in booth #4140.
When used in conjunction with a camera that supports the LockTight system, LockTight CompactFlash employs a unique strategy to protect data, and, as a result, LockTight cards are always "locked.
The workflow of the professional photographer is immediately improved when the time spent transferring content from CompactFlash cards to their destination device is dramatically reduced," said Ed Lee, senior imaging analyst, InfoTrends/CAP Ventures.
We're proud to be a source for these CompactFlash cards with enhanced performance features previously hard to locate.
Lexar's Professional Series of products include a wide variety of flash memory cards and capacities, including the award-winning 80X speed-rated CompactFlash, Active Memory(TM) CompactFlash and LockTight(TM) CompactFlash, with capacities including 512MB, 1GB, 2GB and 4GB.
Shigeto Kanda of Canon and the CFA chairman of the board said: "The development of the CompactFlash 66MB/sec interface means that the CompactFlash interface will not restrict the sustained data transfer rate of CompactFlash cards in the near future.
last week announced its 320MB Type II CompactFlash card, the highest capacity available in this form factor.