Gutsy refuses my CD-R

Mon Sep 24 00:56:58 UTC 2007

Hi,
I run Ubuntu, with XFCE: Xubuntu.
I use either Brasero or GnomeBaker to burn CDs.
I dont want to install Qt libs in order to have K3B.
I have a laptop, with an inernal CD RW + DVD RW DL burner.
The problem is that when I insert a CD-R (not RW), bith Brasero and 
GnomeBaker tell me the medium is not writable.
If I give it a CR-RW, it says it's writable and it burns Ok.

Would you know if this is a known bug?