A Secure Digital (SD) card is a tiny flash memory card designed for high-capacity memory and various portable devices, such as car navigation systems, cellular phones, e-books, PDAs, smartphones, digital cameras, music players and personal computers.
Introduced in 1999 by Panasonic, Toshiba and SanDisk as the successor to the MultiMediaCard, the SD technology is managed by the SD Association (www.sdcard.org).
A Secure Digital card is about the size of a postage stamp and weighs approximately two grams. It is similar in size to an MMC*, but smaller than older memory card types, such as a SmartMedia card or CompactFlash card. An SD card features high data transfer rate and low battery consumption, which are both primary considerations for portable devices. An SD card uses flash memory to provide nonvolatile storage, which means a power source is not required to retain stored data.
Interesting Facts:
* MMC (Multi Media Card) is a flash memory card for cellphones, PDAs and other handheld devices. Introduced by the MultimediaCard Association in 1997 with 4MB of storage, capacity increased to 2GB in the mid-2000s. MMCs were replaced by SD cards, but SD readers support both formats.
There are currently four sub-types of secure digital card: SD, SDHC, SDXC and SDUC, while they are all commonly known as SD cards.
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