Hello, I have a WD My Book Essencial 2 TB 3.0 HD. It is formatted mac with a GUID table and formatted HFS, it had worked perfectly for 3 years on my imac. Now for the last couple of months, OSX 10.10 mounts de drive but then after 5 seconds it gets disconected. I have reformated and nothing. The strange thing is that if I use my windows 8.1 partition using bootcamp on the same imac, the drive works perfectly, it even reads the HFS drive because of bootcamp drivers.
Any ideas why it won´t work in OSX 10.10 but with windows it does??