Removable storage for smart phones comes in the form of SD (secure digital) cards. Depending in size there are variants such as MicroSD (most common) and MiniSD. Phones can only support upto certain amount of memory, with smartphones its usually 32GB. There are speed classes in SD cards specified by the SD association. Class 2 for example support H.264 video recording, MPEG-4 and MPEG-2 video recording.
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