Hi, 1st post. I have a TCD540040 that I successfully added a 160 GB drive to in 2005. I have just purchased a used TCD649080 DT Tivo that I would like to remove its single drive and replace it with the two drives from the 540040. From some of the posts I have read, I have been lead to believe I can switch these drives then do a Delete/Clear and have have the TCD649080's chip sync/marry to the new drives and have it work properly, albeit without any recordings. Is this accurate or way off base? Thanks to anyone who can help.