QUOTE(xoramos @ Nov 17 2009, 10:21 AM)

Format it to be under 337gb, then to 337gb again to make sure?
Yup, sounds good.
QUOTE(xoramos @ Nov 17 2009, 10:21 AM)

What of this 120gb partition? Should I change the start/size blocks?
No - Leave that one alone.
Unless you just want to have one big F partition, in which case you can reduce G (that 120gb one) to 0, then pump F (the current 337gb one) up to the full amount. Up to you, but messing with G will of course wipe it's contents as well, so there's a bit more backing up involved.