When i try to upgrade my stock directv tivo hdd from 80 to 2x160 I get an error saying "unknown backup format" while using mfstools. I went ahead and did mfsadd to get it 1 80 hdd and 1 160 hdd. Does anyone know the reasoning why I wouldn't be able to copy my stock tivo hdd info and shows to a new upgrade hdd.

-I have and R-10 with software ver. 6.2