Secure Digital card333
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Secure Digital card From Wikipedia, the free encyclopedia (Redirected from Secure Digital Card) Secure Digital card Pair of SD cards Media type: Memory Card Capacity: Theoretical maximum: 128 GB in LBA mode Developed by: SD Card Association Usage: portable devices, including digital cameras and handheld computers, Extended from: MultiMediaCard (MMC) Secure Digital (SD) is a flash (non-volatile) memory card format developed by Matsushita, SanDisk and Toshiba for use in portable devices, including digital cameras, handheld computers, PDAs and GPS units. SD card capacities range from 8 MB to 16 GB as of 2008, although sizes less then 128 megabytes are rarely sold in stores. The format has proven to be very popular. However, compatibility issues between older devices and the newer 4 GB and larger cards and the SDHC format[1][2] have caused considerable confusion for consumers. Contents [hide] 1 History 2 Form factor 2.1 Optional write-protect tab 3 Speeds 4 Openness of standards 4.1 Technical explanation 4.2 DRM features 4.3 Compared to other flash memory formats 5 Different types of MMC/SD cards 5.1 Compatibility issues with 2 GB and larger cards 6 SDHC 6.1 SD and SDHC compatibility issues 7 SDIO 8 Extra features 9 Market penetration 10 See also 11 References 12 External links [edit] History In August of 1999, Matsushita (better known by its Panasonic brand name), SanDisk, and Toshiba first announced an agreement on a comprehensive collaboration to jointly develop, specify and widely promote a next generation secure memory
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