Did you get a new PxEngine for it? This helps it Identify newer drives. There is one at the Sonic site here:
This is the newest out there--11/05/2003, number 507. Looks like Adaptec is taking over the marketing now. Stomp has removed the support links for RNM. Adaptec has no updates yet for what they've labeled "RecordNow Deluxe", but Sonic is still working on the engines. This thing just keeps bouncing around!
If it ain't broke don't try to fix it! But, hell if you can tweak that bastard just a little bit more....hehehe.