How to convert MDS/MDF to a VIDEO_TS Folder

How to convert MDF/MDS file to a VIDEO_TS folder with vob file onto a harddisk. I try using PowerISO, however, when watcing the VOB file, only the begining (about 1/10 of the movie) is ok.

I do not the problem. May i know if you guys have an more efficient matter of doing so.

One more problem is that i use a DaemonTool to open a MDS file. However i cannot select a specific chapter that i want to go to. Not sure if i converted to a vob file , will i be able to .

Thank you for your help in advance

Why dont you use the original source, eg. DVD?