I did one copy to 3tb from a 1tb new image you gave me that I then updated to new version and then did the mfstools on (I think it worked although haven't checked much yet-just that the tivo boots up and shows up in my devices again). Thanks much! If I am going to put a 3tb in another of the same model Premiere XL do I have to start from scratch with the original image or can I just do the mfstools again on the updated 1tb to another 3tb drive? Would the updating process and connecting to tivo servers when I put the 1tb back in the box be specific to that serial number or anything? I do have a lot of shows on the not-yet-upgraded premiere xl but the hard drive or expander or both are really giving me problems, so not sure if I would even be able to back them all up and copy them to the 3tb.