PS2 DVD to CD

[p3 700]

Ive got a Jap 10000 and it has problems seeing DVD games.Takes about 5 resets or more to get it to see them.But it works great on DVD movies.Now I have got a pal 30003 with neo key and would like to now how easy is it to copy DVD games to CD's.I know some of the files would need to be altered eg music files to reduce the size of the image but file seems to be in a packed state.now have unpacked the file and could possibly alter the files but dont know how to repack into the same file type any infomation on this would be gratefully received.Or the best way to do this
Thanks in Advance