With all the new Ultra HD (4K2K) video cameras coming out to the market such as the Canon 1-D C and Panasonic Lumix GH4, media professionals need faster writing and larger capacity memory cards. While normal UHS-I U1 and Class 10 cards are fine for normal 1080p HD video recording, a minimum write speed of 10MB/s doesn't cut it for 4K video. Media professionals need UHS-I U3 rated cards or better to record seamlessly without lag or degradation of performance. UHS-I speed class 3 cards deliver a sustained write speed of at least 30MB/s.