Another scsi target error

(i’ve read the previous thread, no help)
the problem is, i get a SCSI Target Error in Nero when i’m trying to write on a specific cdrw-media - a Plextor 4x/10x rewritable disc (the one that comes with all PlexWriters)
I tried to blank it first, no success. I also did that with WinOnCD, and got a …weird message, that “The disc is write protected”



any ideas?

burner: plex 12/4/32S
os: win98SE
winoncd 3.7