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4K video has previously been reserved to pro-level equipment. The memory cards in most devices can't keep up with the capacity or such data.

The next generation SD cards aren't going to miss out on this. The SD Association has announced that an Ultra High Speed Class 3 format, otherwise known as U3 will be available soon. This will guarantee write performance of at least 30 MB/s. 4K video? No sweat. [SD Association via Engadget Image by StephenVelasco under Creative Commons license]