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SD Card is an ultra small flash memory card designed to provide high-capacity memory in a small size. It is a non-volatile memory card format developed by Panasonic, SanDisk, and Toshiba for use in portable devices. It is widely used in digital cameras, digital camcorders, handheld computers, notebook computers, PDAs, media players, mobile phones, GPS receivers, and video games etc. SD Memory Card at present available in various capacities between 16 Megabytes and 1 Gigabyte. It is a very light weight device. SD cards are based on the older Multimedia Card (MMC) format, but have a number of distinctions, like The SD card is in unequal shape. Most SD cards are physically thicker than MMCs. SD cards typically have transfer rates in the range of 10-20 MB/s.

Secure Digital (SD) cards available in 3 basic types. Full size SD cards, mini SD cards and Micro SD cards. Full size SD cards are measured with the size of a large postage stamp and are mostly found in digital cameras, digital photo frames and portable computing devices. Mini SD cards are approximately half of the size of full size SD card and are found in smaller ...
... portable devices. Portable devices like, cellular telephones. Micro SD card is a format for removable flash memory cards. It is the smallest memory card available in the market. The micro SD cards are commonly used in cellular phones, as well as in some newer handheld GPS devices, portable media players, and digital audio players, expandable USB flash memory drives, Nintendo DS flashcards, and digital cameras.

Devices with SD slots can use the thinner MMCs, but the standard SD cards are not fit with thinner MMC slots. Mini SD cards can be easily used directly in SD slots with a simple passive adapter. Using an active electronic adapter, SD cards can be used in Compact Flash or PC card slots. It is good feature with some of the SD cards as they include a USB connector for compatibility with desktop and laptop computers.

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