HELP WITH XBOX DVDr's

[HANS_COBBO]

Hi.

I just recently obtained some XBox title's on 'TECHNO' 4.7Gb DVD-R media, e.g. 'Halo', 'Dead 2 Rights' and 'Jet set Radio Future'. However, when i put them in my DVD-ROM drive in my PC, i get the following message below when i attempt to read them.....

THE DISK STRUCTURE IS CORRUPTED AND UNREADABLE.

I have also tried them on a friends Pioneer A04 dvd burner, and it wouldn't even recognise the disks at all. But the strange thing is, is that they boot flawlessly on my Enigmah modded Xbox every time.

Has their been some sort of protection applied to the discs before i got them?

Any help of someone would be great.

Thanx!!