I'm having similar issues with my TSSTcorp DVD+-RW TS-T633C ATA Device. What's strange is that CDBurnerXP only doesn't recognize my drive when I am trying to burn a data disc. ISO & Audio are just fine. I've upgraded the firmware on the device, and installed the Matrix Storage drivers from Intel with no luch. And my drivers point to \system\32. Any idea on how to fix this issue?