I have a WD hard drive (USB 3.0 compatible) and a Dell XPS L702X.  When its plugged into the computers USB3.0 port it prevents the computer from booting.  This doesnt happen when its in the normal USB ports.  I have tried going into the BIOS utility but cant seem to locate the correct setting to stop the computer trying to boot from the hard drive (I have only succeeded in temporarily disabling all USB ports).  The simple solution is to obvioulsy only plug the hard drive in after I have booted, but I dont want to have to do that everytime as I use the hard drive a lot.  Can anyone help please?  Thanks.