I've tried the way you said but DVD Shrink could not perform it, here's the message:
DVD Shrink encountered an error and can not continue,failed to open file " C:\ ULTRA VIOLET\VIDEO_TS\VTS_01_1.VOB "The system can not find the file specified.
I'm going to try Any DVD + Clone DVD if it does shrink like the upstair's guy mentioned.
Regardless, I'm grateful for advices.
samkee007