ps2 backup disc does not work /w DMS3 Modchip?!?!!

HI!
I'm using a DMS3 v 2.0 Modchip. I downloaded an ps2 image file (smackdown 2 from eselfilme.com) an burned it on to a recommended verbatim cd-r. When i press "x" for the ps2 boot mode a screen appears saying" Please insert a playstation or playstation 2 format disc". All other functions of the chip are available (dvd movie playing, ps1 backup disc playing) but it is not possible to play the ps2 backup disc. do i have to use a dvd-r for ps2 backup?or do i have to patch the image before burning altough i have a modchip?
I am very thankful for your help, because i do not know what to do....
GU