Moved to the main Blank Media forum, as the Test Results forums are for test results only, not discussion. So you're more likely to get help/advice in here.
I have the same drive, and it's pretty tolerant of media quality I've found (both reading and burning). Looks like those Windata discs aren't good, but I think you already know that by now.
No idea about file compare programs I'm afraid, though I'm sure one or two others will.