Two of the smallest available memory cards, Secure Digital and MultiMediaCard memory are used in the very smallest of cameras and other selected devices such as; PDAs, cell phones, and MP3 players. The Secure Digital (SD) Card is similar to the MultiMedia Card in appearance and is cross-compatible with the MultiMedia card. The only difference between a Secure Digital card and a MultiMediaCard memory is that Secure Digital cards have a write-protect switch for added data security. The SD Card maintains a high transfer rate for fast copy/download and exhibits low power consumption to maximize battery life of your digital camera.
Memory Stick memory cards were developed by Sony for their CyberShot digital cameras and can also be used in Sony MP3 players, Sony PSP, PDA's and selected Sony computers. Memory Stick memory cards are the only type of memory that works with Sony digital cameras.