I've just recorded some footage on a 505 using a dvd-r. When I came to finalize the dvd, the camera seems to think the dvd is blank (which it definitely isn't as i can see the recorded area on the flipside). When I put the dvd into my dvd drive, my pc also thinks it is blank. I really can't afford to loose this footage - is there any way to recover what i've recorded? Should i finalize the apparently blank dvd?