Sony Dru500A Help!!!

[tombec]

HI I recently purchased a sony Dru500A which is able to burn both + and - formats. I bought it when I read that PS2 only read the - formats. Well I used memorex dvd- r media and the record now program that came with the drive. when I compared the original and the back up I made on my P.C. they were Identical, but the game will not boot. It just stayed on the insert game disk screen on my GS2 v2.0 . So what am I doing wrong has anyone had success with the sony and if you did what did you do. Also another confusing issue is the movie back ups I have made I use dvd+r media and they play fine in my ps2. so do I need dvd-r only or not? I have a version5 ps2 with the non solder mod chip someone please enlighten me. thanks