I was getting these error messages every time I used a DVD-R with CloneCD, however having had a brainwave and thinking that win98 cant handle a file any bigger than 4Gig, I decided to try burning the DVD on Win XP - guess what, it worked and has done every time now with no errors what so ever.

I dont know if this cures your problem, but it certainly cured mine and stopped the mass production of coesters that I was making - he he

I used DVD Shrink 3.1 and then CloneDVD2 with a variaty of mirror platinum and Riteck DVD's