Hi, I'm looking to change my iMac to a MacBook in the next couple of weeks and have a question about swapping the hard disks. I'm going to have to sell my iMac before getting the MacBook so will have to back up all my data onto an external disk. My question; If i get an external 2.5" HDD (probably a disk and caddy) and back all the iMac info onto that, how would I go about making the change? I'm not talking physically how to, I mean how does it work in terms of formatting etc. From what I've found, the normal procedure would be backup data to external disk. Replace Macbook HDD. Format and install OSX to new HDD. Put data back on. But because the external disk, with backup data on, would be the one I would be putting in the new MacBook, obviously I can't format it when I install it as it will wipe all the data. I've thought of a couple of possible plans and would like your opinions/comments: 1. Backup data onto new drive. Get new Macbook, copy data from new drive to Macbook drive. Swap drives and format the new one. Reload backup data from original drive (now external) 2. When I backup my iMac, install OSX onto the new disk before so it is essentially ready to rock when put in the Macbook. No.2 would be the easiest I think, but is this even possible? Cheers in advance, any help appreciated!