I have tried to make a copy of my "HITCH" dvd and everytime i do the following message comes up about 30 seconds into the copy:

Processing error:
D:/VIDEO_TS/VTS_08_1.VOB: read error
Data error (cyclic redundancy check)
If reading the media has failed, please clean the surface and try again.

then under "details" its says:
File 1 D:/VIDEO_TS/VTS_08_1.VOB 23 TCSectorReader

Can anyone tell me what the problem is? this dvd is an ex-rental and has a fair few scratched on it.

thanks,
Trent