I have a lite-on 411s and my friend has a 401s and both are exibiting similiar errors. We use the bundled RecordNow DX software to burn DVDs either with authored files, or DVD Shrink to make DVD backups and we keep getting sporatic 'files do not match source' errors on the verification process. My 411s is actually making some unusual popping and crackling noises, so I sent it back as a rma. My friend is still struggling. He has used a dozen different types of media with mixed results. He has talked to liteon tech support to no avail. He has the latest firmware - in fact, his was ok until he flashed the new firmware.

Any thoughts?