text: easiest way to transer from hard drive to 2nd hard drive?..can windows xp be used on both drives?   you can have two (or more) hard drives in once machine.  the second (slave) harddrive does not need to have windows installed on it, but it does need to be formatted by windows.  plug in the new harddrive, boot up the machine and it will pretty much do the work for you.  then you'll see a new drive under my computer, and you can just drag and drop files between the two drives.  does that answer the question?