from time to time my ASUS ROG doesn't recognize the sdd and the sdd doesn't apear in the bios. As the laptop have 2 hdd slots I have tried both and the result is the same. it happens only once or twice a month and will fix by itself after 1-2 hard restarts. Never had this issue with the old hdd, even now when the sdd is not recognized the hdd installed on the second slot is there.