Devices such as netbooks, digital cameras, camcorders, PDAs, mobile phones, video game consoles and digital audio players as well as many others use them. Smaller devices tend to use MicroSD, or MiniSD rather than full sized SD cards.
SD/MMC cards have replaced Toshiba's SmartMedia as the dominant memory card format used in digital cameras. SD cards are based on the older MultiMediaCard (MMC) format.
Most SD cards are shipped preformatted with the FAT or FAT 32 file system.
For flash memory cards, the average number of writes before failure occurs is usually around 100,000 times.
xD cards are NAND flash chips in a special 18-pin package design.
SDHC (Secure Digital High Capacity, SD 2.0) is an extension of SD increasing card storage capacity up to 32 GB.
Secure Digital Extended Capacity (SDXC) format was unveiled at CES in January 2009. SDXC cards have a maximum capacity limit of 2 TB or 2,048 GB.
