Can't "Read" DVD-R Dual Layer

Hi everybody,

I burnt a DVD-R DL disk sucessfully with K3B using a TS-L632M drive. After reinserting the DVD it won’t monut. I tried mounting it manually but the system couldn’t find the disc.
It mounts on the same Laptop under WinXP (even though it struggles reading it). It can be read on other Computers as well!
So what can I do that SuSE can read/recognise it. Once I have read somewhere that you can set something like error tolerance or reading accuracy?

ok, almost fixed the problem -> cleaned the lense :\