CompactFlash cards
contain both memory chips and a controller. Most digicams that use
CompactFlash (CF) cards can use ANY capacity card up to 1GB (and probably
2GB) with no problems. CF cards above 2GB use the FAT32 file system, the
camera must be able to read this format or it won't work.
A new type
of ultra-compact memory media that has been developed jointly by
Fujifilm and Olympus. It meets the demands of new camera technologies
that deliver larger image files and have the ability to record
high-quality movie footage. As well as the potential for large
capacities, xD picture cards have a high read/write performance and are
only 2 grams in weight.