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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 2019.

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 ?
Limited tenders are invited for procurement of pcmcia ata adaptor for cf card and flash memory card
Tenth, in the previous automated elections, the reading of the data found in the SD card (CF card before) is required only if the results were not successfully transmitted to the canvassing center.
The 1DC comes with a standard EF mount, meaning all existing EF lenses from Canon are compatible with the camera and all the footage recorded gets shipped off to the CF card slots.
When the results of Sound Devices' successful testing of Delkin's 633x/163x 16GB SD Cards and CF700X 16GB CF Card were released in November 2012, Talamas had already been an authorized Delkin dealer for some three months; a move spearheaded by Sales Representative, Kari Papadinis.
The EXpert is the same great digital scouting camera the hunting world has come to rely on, but it's now more compact, has an enhanced flash range (60 feet) and provides easier access to the CF card. The EXpert features a 3.0-megapixel custom digital camera and Instant Trigger Technology.
A 64 MB CF card can store approximately 2,350,000 time-stamped temperature values from a single channel.
The camera permits firmware upgrades by downloading the new program to a computer from Canon's website, then writing it to a CompactFlash card and loading it into the camera from the CF card. The camera accepts CompactFlash Type I and Type II cards, and is compatible with IBM Microdrives.
The highest capacity CF card currently available in the market is 1GB, also available from Pretec.
The rechargeable Lithium Ion 3.7V 1400mAh battery can power the unit for over 30 file transfers (based on a 64MB CF Card) and provide up to an hour of LCD viewing with a full charge.
Media storages are through CF+ slot (CompactFlash Type II), which can take more than 5000 pictures in VGA mode, or store more than five hours of MP3 music using Pretec 320MB CF card or IBM Microdrive, the smallest hard disk in the world ( microdrive).
Limited Tenders are invited for The Procurement Of Pcmcia Ata Adaptor For Cf Card And Flash Memory Card