V30 – steady speed for video recording
V30 and U3 stand for a sustained write speed of at least 30 MB/s. This matters for video, where the camera writes data continuously and a slow card can cut a recording short. Writes of up to 45 MB/s and reads of up to 100 MB/s also make moving large video files to a computer quick, especially with the included SD adapter and the computer's card slot.