DVD ripping speed can make the difference.

[wulf109]

I was trying to backup Star Trek DS9,season 5,disk 1. I could not rip it to my HD. I tried DVD Decrypter and Smartripper,in four different DVD-Rom drives,but every one would hangup at the same point,about 50% thru the rip. It even froze in my standalone player at the same point.
I knew the problem was in vob #4 so I tried ripping vob #4 in my Pioneer DVD recorder,while slow it was able to the complete without any problem.
I then ripper the rest of the files in file mode with DVD Decrypter and then had DVD ripped completely to my HD.

FYI

[handyguy]

Did you try playing it first to unlock it? Are you sure it plays fine all the way & is it clean?

[Gazorgan]

It's dirty/scratched. Clean it with toothpaste, or tell your ripper to skip after 5 failures.