cdburning

I start up xcdroast and it tells me it cannot find a disk in the tray.I t will open the tray on
the buttons ok though...I have scsi emulation setup for both the dvd/cd and the cd r/w
I boot using grub and the grub stanza and fstab are set up the same as my debian and Libranet
drives which both work ok....I have alos tried other cd burners in Knoppix but none will rtead the cd...I can play cd/s using kscd so I know the drive is ok...
Any help appreciated.....Please cc to me direct if possible
Regards
Ted