Suddenly it is no longer mounted and won’t mount. I can see through the top that it is lighted but an external hub no longer shows it’s glow light so I gather it is not connecting with the Mac. I have been using it directly connected to the imac not through the hub. I have switched USB cords but neither the disk utilities nor Disk Warrior can recognize it. Your thoughts please.
I have been using my WD 3T hard drive on my imac for almost a year using (os mac extended journaled).
Have you tried using another power supply?