Added on 11/28/08
The physical characteristics of these cards are their weight, 0.07 ounces, their size, one sixth of a credit card (32 mm x 24 mm x 2.1 mm) particularly lends them to communicating mobile markets: personal assistants/PDA, MP3 drivers, Mobile phones,...
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The physical characteristics of these cards are their weight, 0.07 ounces, their size, one sixth of a credit card (32 mm x 24 mm x 2.1 mm) particularly lends them to communicating mobile markets: personal assistants/PDA, MP3 drivers, Mobile phones, also to digital equipment such as cameras and others. Their rate of data-transfer varies between 2 and 4 MB per second. Compared to the Multi Media Card composed of 7 connection pins, the Secure Digital card is composed of 9 connection pins. This new organization allows faster transfer of data while the memory card is on SD mode. On the other hand, the Secure Digital has an integrated security mechanism, the CPRM - Content Protection for Recorder Media - which insures a high degree of protection and file-encryption. It controls the reading, copying, transfer or erase functions. In this way it becomes possible for the user to forbid or authorize the copy or to offer a reproduction right. * Maximum 3MBps read/write transfer rate * Compatible... See less 
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