If you are ripping files from the CD(I assume this is the plexwriter) to the 80gig drive, then this may account for the increased time. Ideally, you don't want to have the source and destination devices on the same IDE channel. In your situation, I would replace either the 20 or 30GB drives with the 80. This would move it to the primary IDE and increase data transfer speed. Alternatively, you could add another IDE controller card.

Peter