I only have USB hard drives. I need an adapter or a dock or a USB hub to connect to my hard drivers. I just came back from work and connected my MacBook to the dock and everything works now. It happened yesterday too and I was stunned, but when I rebooted my Mac it stopped working.So plugging in your external drives directly into your Mac (not using hubs - I mean directly straight from the drive to your Mac) does not work?
I'll make a Time Machine copy while I can or maybe if I'm lucky the issue is fixed?