I have 3.0 atm and I am updating to 3.1.2 so I want to delete everything on the ipod, erase everything then install the new firmware. Does it do this through recovery mode? I heard that if you go into dfu mode and restore it erases everything full, is this true? I had a lot of crap files scattered on my ipods hd and wanted them all to be gone. Thanks for everyones who helps.