I just used Clonezilla (booted from CD) to clone my 300GB to a 1TB. First time I just let it do the default, and my 1TB showed up as a 300GB. Booted into Clonezilla again and went with the advanced mode - , let it automatically fix any disk errors on the target disk, and checked the box for 'extend partition to fill target disk' (paraphrased), and left the rest as default. worked like a champ.
I did NOT have more than 15 shows/movies on the drive, so it went quickly, and if i lost them, i wasn't going to care much. it was worth trying and learning. Hope it helps someone else out!