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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 ?
In addition to support for Write Acceleration technology, the Pentax *ist D has a CompactFlash II slot and supports FAT32, which ensures compatibility with Lexar Media's new 4GB CompactFlash card.
Providing the mobile user with additional flexibility, a CompactFlash II expansion slot offers a suite of productivity add-on devices such as Global Positioning System, bar code reader for inventory management, Wi-Fi (802.
It features four dedicated slots to accommodate all popular types of media including: xD Picture Card, CompactFlash(R) I, CompactFlash II, SmartMedia(TM), Secure Digital, Mini Secure Digital (Mini SD), MultiMediaCard, RSMMC(b), IBM(R) Microdrive(TM), Memory Stick(R), Memory Stick Duo(TM)(b), Memory Stick Pro(TM), Memory Stick Pro Duo(TM)(a), Memory Stick MagicGate(TM)(a), and Memory Stick MagicGate Duo(TM).
The device can write data on both CompactFlash I and CompactFlash II memory cards at up to 25MB per minute and can read at up to 40MB per minute.
8" diagonal color transreflective display (240 x 320 resolution) -- 65,536 colors (16-bit) -- 32MB ROM -- 96MB user memory (64MB RAM/32MB NAND flash memory) -- USB Client/Host port -- Secure Digital and CompactFlash II card slots -- Integrated Wi-Fi (IEEE 802.
The sleekly designed silver Toshiba Pocket PC e740 lets users do more with the built-in CompactFlash II and SD expansion slots, ready for additional memory storage and Bluetooth(TM) connectivity (via optional Bluetooth SD card), as well as productivity devices such as a global positioning system and barcode reader.
5-inch diagonal TFT display Number of Colors 64K (16-bit) Graphics Processor ATI IMAGEON(TM)100 RAM 64MB ROM 32MB Input Method Stylus, Touch Screen Communication Port Host USB Cable USB Power Synch Cable Cradle USB Card Slots Secure Digital and CompactFlash II Connectivity Integrated Wi-Fi (IEEE 802.
dual built-in Secure Digital(TM) and CompactFlash II expansion