Hi I just bought a new Macbook pro OS X10.10.2 and the “My Book Essential” (USB3) is not mounting. It is not recognised in disk utilities either.
I still have my old Macbook air OS X10.9.5 and it recognises it.
It has been reformated to MAC OS extended (journaled).
I have downloaded from http://support.wdc.com/product/download.asp?groupid=125&lang=en
on the old mac - to see if it was the firmware
I have another portable hard drive that the Pro recognises. and it recognises USB sticks, but it wont recognises the WD My Book Essential (1TB)
Thanks for any help