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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 2020.

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.
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References in periodicals archive ?
These next-generation cameras and DSLRs will produce photos of unprecedented quality, and the large file sizes can quickly overwhelm a CompactFlash memory card's data-transfer rates and halt shooting.
The SanDisk Extreme Pro CompactFlash card features 128 GB of storage and write speeds of up to 100 MB/s.
Similar in size to a CompactFlash card, the new specifications' access control function and highly durable form factor produce a combination of physical ruggedness and reliability that is indispensable for professional usage models.
Kingston CompactFlash Ultimate 600x Features/Specifications:
SanDisk Extreme CompactFlash cards are available in capacities of 8GB to 32GB, while SanDisk Extreme Pro CompactFlash cards are available in capacities of 16GB to 64GB.
An advanced static wear leveling function developed by TDK is also included to equalize data writing to all memory areas of the Flash memory, greatly increasing the write life span of the CompactFlash cards and SSDs.
By incorporatinghigh-speed, durable SLC NAND, TDK created CompactFlash cards and Flash memory drives optimal for industrial and embedded applications that require high-speed data write access and high-frequency data writing.
Additional features include a 10/100Base-T Ethernet port, two RS-232 ports, one RS232/485 port, an externally accessible CompactFlash slot, and Windows CE 5.0 bundled on 64 MB of internal flash memory.
It also offers communication via CompactFlash, serial, USB, and Ethernet.
Included is 32 MB of built in memory and an expandable CompactFlash card slot for more storage.
The card fits into a CompactFlash slot and reads/writes to all ISO 15693 RFID tags, and also many proprietary 13.56 MHz tags.