Hi, I've got two Macbook Pro's (15" and 17") and i've recently purchased a new internal HDD to swap in the 15". However the 15" does not have a disc drive, so i basically just decided to put the hard drive into the 17", format it with OS X Journaled and then just install Leopard. It's currently installing however what has just really smartly hit me is whether it would be compatible into the 15". If so whether there are going to be any issues and so forth. Many thanks in advance, Sy.