Can anyone tell me why my external hard drive is not showing up on the Mac, and how to fix it? Reading something that the Toshiba hard drive won't show up on Mac laptops due to lack of power, I tried using an external powered USB hub still nothing. I have tried to swap around the USB connection cords but still not showing up. But when I plugged it into my Macbook Pro (mid 2012) it didn't show up. I have a Toshiba Canvio 1TB USB 3.0 hard drive. 'Toshiba external hard drive not showing up on Mac' is a frequently discussed question in the Apple support community.
