Hmmmm....
Very strange...I have not seen anyone else here reporting this issue, so hopefully it's defective hardware on your end, and hopefully Sony replaces those damaged disks...
When you opened it up, could you tell what caused the damage?...was there a metal burr somewhere?...internal to the drive maybe?....
We look forward to hearing what Sony has to say...
I have one of these that I just purchased, but have not yet setup...I think I'll wait a bit, and definately test with non-commercial/replaceable discs!