It's happened to me, but it was a corrupted file, seeing as how you deleted all the data, that's not your case. Try cleaning your disc tray, and wiping the disc with a damp, clean cloth. Just remember, the slightest scratch on blu-ray discs wrecks them. See if that works, if it doesn't it's probably the disc.
Naughty Dogs #1 Fanboy!
"I hate cliff hangers." -Ellie.
Asshatery knows no boundaries.