WD Mybook not mounting
I have 2 different iMacs; one is an intel 2009 and the other is a 2013. Both are running Mavericks. I am in the process of "retiring" the older one since it seems to be slowing down. I have 2 different WD Mybook external Hard Drives and an OWC external HD. 2 out of the 3 hard drives mount and work correctly on the newer imac. All three work properly on the older iMac. Does anyone know the solution? I am using the USB connection on both computers and have tried all the different ports to see if it was a faulty port or not. I've tried shutting down the computer to no success. I'd prefer not having to buy a new external HD and transferring data but will do so if necessary. Any recommendations on a new HD would be appreciated as well.