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CompactFlash cards are one of the most common type of memory card. They have a controller chip and allow for faster transfer rates. Most digital cameras that use CF can use any capacity up to 1 or 2Gb without any problems. However CF cards above 2Gb use the FAT-32 file system which the camera must be able to read for it to work. CF cards come in two sizes; type 1 (3.3mm thick) and type 2 (5mm thick). Only cameras with type 2 slots can use either type of CF card. Compact Flash 1 cards come in a range of sizes from 8Mb to 8Gb. Typically Type 2 cards, which tend to come in larger capacities, are only supported on larger cameras.