Upon update to 10.13.3 a message said i could not use my backup disk (Toshiba 1TB, usb.) It will not mount and disk utility will not recognize it. I tried to erase it and it can't find it. When I plug it in it poles, blue light flashes. Do I have a dead drive or is it worth saving and how?
Machine Specs: 27" iMac | 8GB DDR3 SD Ram | 1TB Drive | | Magic Mouse 2 | Apple Keyboard | macOS High Sierra 10.13.3
Machine Specs: 27" iMac | 8GB DDR3 SD Ram | 1TB Drive | | Magic Mouse 2 | Apple Keyboard | macOS High Sierra 10.13.3