Cant make backup of my own Games ! *Plz HELP*

[Ulrik]

Hi, i have a modified Xbox and a Nec 1300 DvD-Burner.
And iv done exactly as the "DATA BURN method with screen shots" guide says.
But when i put in the DvD in the Xbox it just says "Unknown".

I have:

EvoX
RemoteX V1.8.3285

Is it the way i burn or is it my Xbox that is strange ?
Have tryed with DvD-R, DvD+R, DvD+Rw.
I think i have a Xbox with a modified Bios, becous when i got my machine modified, they said they installed a chip and did something to the Bios and then remove the chip again.
I can play all kinds of DivX movies, with the DvD cds that i made.
And i can make backup of the games with "XbCopy" to the xbox hd, and play the games from there.
But when i try and copy it to a DvD, it just says "Unknown".

What could be wrong ?