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 videos.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,... Less

More capacity to capture it all. More speed to get the shot. When you need speed, go with the SanDisk Extreme 45MB/s Edition SDHC card and get more out of your DSLR or advanced camera. Lightning-fast speed and professional- grade responsiveness give you longer continuous shooting performance and faster photo and video transfers from camera to computer when used with the ImageMate All-in-One USB 3.0 Reader. Based on the Ultra High Speed (UHS-I) bus architecture, engineered to the highest performance standards and tested in the harshest conditions; that's why when the very best is expected pros trust SanDisk. Specifications Performance/speed : Up to 45 MB/sec * read and write speeds Bus Interface: UHS-I (fully backwards compatible with SD 2.0) Operating... Less