Bad area at end of disc?

My burner is a Lite-On LTR-52246S. Is it normal for there to be a bad (red unreadable) area at the end of a disc in ScanDisc? I read it might have to do with the Track-At-Once recording mode. This happens with both Easy CD Creator and Nero. This won’t harm my data, will it? Thanks.

If you’re talking about the last sector, it’s due to leaving the disc open. (TAO)

CD Quality Test doesn’t show any errors so is that probably the cause?