When I upgraded my Tivo's with Maxtor 120GB drives, I had the same problem. Some of the guru's here pointed me to a Utility that switches the drives to a quiet mode. If the noise you hear is chattering, this might be the solution. For me, it made both my Tivo's virtually silent. The utility is available for most drives, and can be found on the manufacturers web site. If you think this might be your problem, and can't find the utility, let me know and I will dig it up for you.
MEHM
