But the next time I plugged it into the Mac, it didn't work. After an hour, the speed increased to the usual 30-40 MB/s and it ran fine after that. I tried connecting it to the laptop directly, and via a powered USB hub, which made no difference.Īfter this saga began, it did show up once on my Mac, but was able to read data at only 900 KB/s. I applied all software updates, and rebooted, just to be sure. I know the OS or the computer are not the problem because I tried two different computers, a Mac and a Windows. I know the cable is not the problem, because another disk works perfectly with it. It does show up as a USB device in Device Manager, so my understanding is that the computer is able to talk to the controller in the disk, but the controller is not able to talk to the disk itself. The LED keeps blinking on and off in a regular pattern, not the irregular pattern indicative of data being accessed. It has worked fine for 10 years, but for the past week, it doesn't even show up in Disk Management on Windows or Disk Utility on Mac, not even as an unformatted hard disc.
I have an old WD My Passport 2 TB USB 3 external hard disc.
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