Review on 5-Year Data Recovery Included! Gigastone 64GB Micro SD Card 2-Pack - Ideal for Nintendo-Switch, GoPro, DJI, and More - High-Speed Read/Write up to 95/35MB/s - UHS-I U3 A2 V30 C10 by Ronald Noel

I've had a Gigastone 4K Game Pro (Red) for over 2 years and it still works in my DVR, no problem. I just received this black version and decided to use the same ATTO Disk Test 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! Strange, with the red version I get 20MB/s write and 150MB/s read!?!One of these cards goes to the security 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). I repeated both tests a few times, also changed the card reader (both USB 3), but the test results were the same, one card is fast, the other not very. So good luck to you!