DVDSP recognizes wrong DVD drive

My Superdrive no longers burns DVD's reliably so I put a second drive in (second drive (burns both DVD and Blu-Ray) is set to Master and Superdrive is set to slave), but wanted to keep the old Superdrive to read and play discs. At first DVDSP recognized the second drive and then the next day, it kept opening the Superdrive tray and I couldn't burn. So I set the System prefs to open the new drive when I inserted a blank disk in the new drive. That solved the problem until today. and we are back to the old Superdrive (which reads but does not burn). I tried inserting a blank disk which then opened DVDSP, but when I went to burn, DVDSP opened the Superdrive tray and asked me to insert a blank disk. I can't find anywhere in the system to tell DVDSP to use the new drive. Any suggestions?