Yes it is, you will need to trick the xbox into unlocking the drive by hotswapping the replacement ( swaping them when the console is powered in) you need an app called chimp and a molex power splitter, connect splitter and boot up xbox. Disconnect dvd drive and plug in larger hdd, run chimp and select clone/copy partitions - you will need to change the jumper to either slave or cable select. When finished the copying go back to menu and select lock hdd , when locked then power down and swap new hdd to master position, boot up and if new hdd is bigger than 250gig you will need to format the extended partitions with xbpartitioner. With an ide-sata adapter you can go up to 2tb should you wish.