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I was running Intel RST version 11.5, and it kept giving me an unknown error when accelerating one of my drives. I updated to 11.7 and got the same result (even from the command line in safe mode). I'm now running 12.5, and now that drive is not even showing up on the dropdown menu (see screenshot). I tried switching the cables round for the two drives in case it was an interface issue, but it made no difference. Can anyone help me troubleshoot this? Thanks.