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From Free Knowledge Base- The DUCK Project: information for everyone
/* SD Card - Secure Digital */
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Secure Digital Memory Cards are tiny, easy-to-use memory storage devices made for a wide range of host devices. SD cards provide encryption capabilities for protected content to ensure secure distribution of copyrighted material, such as digital music, video, and eBooks. SD cards are available with storage capacities as high as 4 gigabytes.SD cards are more rugged than traditional storage media. They have an operating shock rating (basically, the height you can drop them from and still have them work) of 2,000 Gs, compared to a 100-200 G rating for the mechanical drive of the typical portable computing device. This translates to a drop to the floor from 10 feet, as compared to a single foot for the mechanical disk drive.SD cards use metal connector contacts, instead of the traditional pins-and-plugs, so they aren't as prone to damage during handling. The SD card was jointly developed by Matsushita, SanDisk, and Toshiba.