Should work OK even though the OP systems are the same. The best way to set up your new drive first. The new drive should be atached to the primary IDE interface as a master (set the jumper). If not already set up, partition it as an active primary, format it and install the Op system. Once you are satisfied that the system is set up and working the way you want it, shut down the system and install the old 10gig drive. If you install the old drive to the same IDE interface you will have to set it's jumper to slave. If you install the old drive to the secondary IDE interface you can leave the jumper as it is. That's all there is to it.