From the horse's mouth, so to speak...
http://uk.playstation.com/ps3/support/network/detail/item250047/Use-the-data-transfer-utility/
@Cthulhu - You don't mean a disk image lol - you mean transfer your unlocked saves. You'll need to be Failoverflow or GeoHot for a drive image to work in a different PS3 

Proud Sony Rear Admiral







