Are you trying to break his balls or what?. Install your bg HD and start the computer. It will then tell you it cannot find a disk with a system on it. Kindly insert your OS disk into the CD drive and let it boot. Install your OS. It is better to reinstall all your crap fresh and just move your data back in at the end. Now if for some reason your old system appeals to you more at the end you can start up from a CD and reformat the 120 and clone off the 20 gig. Everything below will work but it is alot of trouble for no special gain. Good luck. jj >>>>>using OSX?? I hope so, Get CarbonCopyCloner, its free. put the 120 into your fw drive enclosure. clone your cube drive to the 120, put the 120 in the cube and boot up. anders On Monday, March 3, 2003, at 01:27 PM, Meirion Roscoe wrote: > OK, I've finally received my western digital 120GB hard drive with 8MB > cache. Now if only I could work out how to change it over! I realise > that the cube zone must have a Gucci set of pictures with how to whip > the old one out etc. But...... > I have a 20Gb firewire drive to move my files to whilst the exchange > goes on , but how do I then boot up the new drive if it has no OS on > it? I know I can use my firewire drive in TGT disk mode but if the > new drive has no OS on it, how's it all going to work. Doh, my head > hurts! > > Any help would be much appreciated. > > Cheers > > Rossi<<<<<<<<<