I just received a DVD from Lovefilm through the post and annoyingly it has a small-ish crack running out from the centre. Not that unusual. Irritating, but it happens. However, I just put it in my DVD player and it appears to work, even skipping through a bit of the content wouldn't make it skip or stop. So, my question is: Is it possible that a DVD could have a visible crack but still play fine? And is there any software that can scan the disk for errors before watching it so I don't find out there is in fact an error with 20mins left?