This is absolutely ridiculous. This issue has been around for years now and every time there's an update it requires a hack to sort it out. What about the poor people who don't even know what Terminal is. Time to fix this Apple!!!!! It almost seems with every new version of Mac OS that they make it harder and harder to fix the problem. I've been at it for 3 hours now and still no joy. Lots of success and then a fail at the end. This is with the bless command which wasn't required for earlier versions. Getting a Permission Denies/Couldn't mount the volume mounted at/ So frustrating!!!