I've only recently discovered that if you burn at 4x the DVD is more likely to be read by all DVD players instead of just the newer ones. Therefore I have several I've burned at 12 or 16x that cannot be read by my older players and would like to rewrite them at 4x. Is there any program or any way to scan a disc to tell how fast it was written, instead of trying to load each disc in the old player? I would rather load them all in my pc to check as some can be read by the older players, only to fail when you fast forward or try different menus and it would take some time to preview all the discs. Thanks.