I've had a Gigastone 4K Game Pro (Red) for over 2 years now and it still works in my DVR, no problem. I just got this black version and decided to use the ATTO test of the same disk and as you can see in the attached image the write speed is 40MB/s and the read speed is over 90MB/s! That's great! Funny, with the red version I get 20MB/s writing and 150MB/s reading!?!One of these cards goes to the surveillance camera, the other one will be the backup. But here's the "bad": I tested the second card and to my surprise the speed is 28MB/s W and 42MB/s R (second picture).
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