MacBook not reading 2TB My Passport for Mac

Ok, that may be so for a disk that is corrupted, but I am more concerned with my specific one, which seems similar to the one above.

I recently upgraded my 2010 Macbook to Yosemite. My two WD Green hard drives (series numbers WD20EZRX and WD10EADS) are no longer visible. I have read through your forums and am yet to find a solution.

What is the solution?