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CompactFlash (CF) is a type of flash memory, commonly used for storage in early digital cameras and other digital devices, and still in production (2011). It was originally created by memory manufacturer SanDisk in 1994, with the interface loosely based on the existing PCMCIA slot standard.

Formally, the name "CompactFlash" is written without a space, although "Compact Flash" is also commonly seen. Called compact because it is approx half the length of PC cards (PCMCIA). There are two types - with different thicknesses: type I - 43×36×3.3mm, and type II - 43×36×5mm.

CF is long-lived compared to other flash formats, and new, faster and larger-capacity cards are still in development (in 2017); cards exist in sizes from 2Mb to 512Gb.