Wow, Id love to know what UHS-II card you have as my Sandisk is registered with a max 260mb/sec used in an EOS R?Absolutely Amazing! Specially since read speed on UHS II maxes out at 300 mb/sec and write speeds are always lower. Hypothetical max transfer speed on UHS II is 312 mb/sec. Your Canon R must have been sprinkled with some magic Pixy Dust!
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