The drive expansion and upgrade FAQ
http://www.tivocommunity.com/tivo-vb/showthread.php?t=370784
has grown beyond its Series 3 roots, and you should probably post your question there as well, where, I suspect, it is more likely to attract those who can give you the answers you need.
And of course for anyone considering a SATA drive in an S1 or S2, the
"List of SATA to PATA (IDE) adapters, please add yours" thread
http://www.tivocommunity.com/tivo-vb/showthread.php?t=416883
is absolutely required reading.