Abbreviated as xD (E
xtreme
Digital), the xD-Picture Card is a type of removable
flash memory designed for use in
digital cameras. The xD is ultra-compact with its size of 20mm x 25mm x 1.7mm. The xD-Picture Card was developed by Fuji film and Olympus and are used in many models of digital cameras made by Olympus and Fujifilm.