Okay, I have found out the problem, I searched in another Dreamcast forum and the problem is that Ikaruga was originally intended to be an image for Discjuggler version 4.0 and all this time I have been using Discjuggler 3.5! Dammit!!!! All you have to do is get a normal 700meg cd and burn away and it should work using DJ4. Simple!
Oh and whats this about patching for PAL Dreamcasts? I dont understand that, how do u do it?
I dont think u'd need to patch anything, sounds too confusing!