I want more recording time on my Phillips DSR 704 Series 2 Direct Tivo

In the system information it shows I am running software 6.2-01-2-301

I have a new Western Digital 160 Gig drive ready to go...

How many hours will this give me...

I can go up to 400 Gig if what I read is correct ?..?

I do happen to have a second 160 Gig WD Drive, a Y and a Standard PC cable for dual drives.. Is there something special about the cable... a user modification or purchase a new cable...

I saw in the instructions where it says to be sure to clear and delete everything.. If it is a fresh drive image there should not be anything to delete from it so I assume they want all of the wishlists etc cleared...

Could someone walk me through this slowly...
I am VERY comfortable with PC's and dual boot a Linux system with a network but this is the first peek inside the Tivo...

I also understand that it will take up to two days to get my locals back...
(I can handle that I just need to make sure I do it when the wife does not have a show she MUST watch)

Thanks for taking the time to read this and I will download the ISO as soon as I know which one I need...

Once I get this working I start in on networking it...