A cheap solution.

You are upgrading from two smaller drives. Make sure you load the 2.0 kernel. Install the original master drive in the player and the new 80GB as the slave. Boot and drop to shell. From here, you will be able to build the new drive using the fully installed kernel from your old master. Just be careful not to destroy the data on the old drive (make sure that all your commands point to the secondary drive, hdc...)