After I’ve found the necessary procedures here I switched my new Liteon OEM burner DRW-1S45 to LDW-451S and next to LDW-851S.
While burning DVD+R at speed 8 was fine, burnig a 1 GByte session on DVD+RW did make the medium nearly unusable. PI/PO raised very much and the burner - either as 851S or backflashed to 1S45 - was not able to access the medium anymore. I managed to make it usable again with a Ricoh MP5240A but after rewriting the complete medium with data the KProbe scan looked like this:
Oh my, forum software refused to upload the file now 6 times.
Please, what is a “VALID” gif or jpg file???
No word in F.A.Q. what’s the diffenence to a “normal” gif or jpg file.
Okay, I’ve noticed that’s currently a general problem here, so I follow the advice from pinto2:
I think the 851S session can easily be identified… 
This session also had a much darker colour on the medium, the write strategy in “851S mode” must have changed significantly.
Is it a general experience that upgrading to 851S worsens rewriting in such a way?
