New Hard Drive

I have had my Tivo for some years now and I think the hard drive may be on its way out and would like to instal a new one.
Does installing a new drive affect the tivo subscription? ie is all the unit information stored elsewhere and so replacing the drive have no effect or will I need to pay for a new lifetime sub?
Many thanks
Does installing a new drive affect the tivo subscription? ie is all the unit information stored elsewhere and so replacing the drive have no effect or will I need to pay for a new lifetime sub?
Many thanks