You need to take the drive out of your xbox that is why most people use a second drive you need 3 items
the 0800 drive, a SATA cable and a means to power your drive. I use a power dogle from Maximus.
Once you get the drive hooked up to your PC you start xbox backup creator then read the original disc that will pull everything you need from the disc then you use IMGburn to burn the .dvd file to a dvd+r dl disc.
I have 2 spare 0800 drives I am trying to sell send me a PM if you would like to buy one.