
Last October SanDisk quietly launched what was then the highest capacity SD card you can actually buy: the 2TB version of its popular Extreme Pro SDXC card. Though no slouch - boasting a 250MB/s max read speed and up to 150MB/s write speed - this is still just a UHS-I SD card, and consequently it sports a fairly pedestrian V30 video speed rating, indicating it can only reliably sustain a minimum 30MB/s write rate - not ideal if you were planning to record 4K video.
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