Flash Memory is a type of removable storage that retains the data it is storing even after the power has been switched off. This type of memory is used in digital cameras as a way of storing your pictures and swapping them from one device (your camera) to another (PC or memory reader). Each specific digital camera will determine the type of flash memory to use. Popular flash memory formats include:
SD (Secure Digital™) - These cards offer built-in encryption to safeguard data. Also available in high-speed and ultrahigh-speed formats for ultrafast image viewing and data transfer. Current capacities up to 4GB.
CompactFlash® - Available in Type I and Type II form factors. Current capacities rangefrom 128MB to 8GB.
Memory Stick™ -compatible primarily with Sony camcorders, digital cameras, MP3 players, selected CLIE handhelds and VAIO® notebooks. Current capacities range from 128MB to 4GB.
xD picture card™ - Developed by FujiFilm and Olympus to be extremely small so manufacturers could design smaller digital devices. Current capacities range from 128MB to 8GB.