These are the procedures that I took to add an additional drive to my single drive TiVo unit to increase the total record time. This procedure will also allow me to create a backup image in case my drive ever fails( ). All software with the exception of the back image are contained on the MFSTOOLS CD. This is a downloadable .iso image that can be burned to a CD. This procedure is not a complete instructional but merely the steps I took in this one task.