BBB use USB Hard drive after boot

Hello there ,

Just for the begining ,Im new to BeagleBoard enviroment and not so good with Linux, so please be patient and understanding. Im really curious , is it possible as for now to use External Hard Drive ( with its own power supply ) , as main drive after the booting sequence ?
I already tried to follow those instructions :

but they seems to be a little bit outdated.

Currently i`m using : , flashed into eMMC on BBB rev c.
Any ideas where to go next ?