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What is memory? Removable Storage: MicroSD Cards SD (Secure Digital) cards and their smaller MicroSD and MiniSD memory-card cousins are the types of removable storage commonly used in portable and wireless devices to store data such as video, music, and image files. The main difference between standard SD, MicroSD, and MiniSD cards is their size. According to iSupply, most cell phones that shipped during 2010 used the smallest of the three card types, MicroSD. If you're planning to store a large quantity of large media files (such as video) you may want to choose the largest-capacity card that your device will accommodate. The capacities of the MicroSD cards used in most cell phones range from 2GB to 32GB. The 2GB cards retail for less than $10; 16GB (Class 4) cards commonly sell for around $50; and 32GB cards can run as high as $150. The SD Association has established various speed classes for SD cards. These classes represent the minimum speeds required to write various types of data to the card. Following are the most common speeds, together with the types of content they support, according to the SD Association. Class 2 : H.264 video recording, MPEG-4, MPEG-2 video recording |
