1 - given that i've never done an upgrade before probably best to use instantcake for simplicity? 2 - can i use the instantcake cd to create a brand new hard drive out of the box to plug right into the HR10-250 unit and just start using it right away? 3 - just curious and switching gears here - can i plug a good HR10-250 hard drive into a HR10-250 with a bad hard drive (replace it i mean) and it will work after a simple swap? should i do a full clear and delete on the good hard drive unit before i would replace it onto the bad unit? or does it know that it was already activated on the other unit and cant be swapped? thank you for your help and careful attention the tivo-fans always give when answering!