I've searched and searched to no avail. I'm hoping that someone can help me clear up the problem. I had used the Plextor PX-740a for a long time with my RiTEK D01 DL DVDs, using CloneDVD2 and AnyDVD. Never had a problem with any of them. However, that drive crapped out on me and I got the PX-750a. Using the same discs and the same program combination, I got the "source data too large" error when it started to write. Thinking it was the drive, I switched to the Sony DRU-820A. Still getting the same error. Is there anything that I can do?