EDIT: I ended up scratching the used disk very discreetly. It should not be readable now (it wasn't very readable even before). The clerk at the store did not notice it.
That's absurd. Of course it's possible, just something (software, firmware) prevents it, sensing that the media is written already. But it's not impossible in principle to write the media again, it's just a decision to prevent it, made by some component of the soft/hard chain. I was hoping there's a way to override it.
EDIT: I'm not saying "delete and write again the write-once media". I'm saying "just burn the heck out of it, regardless of what's already on it." I'm talking about a destructive operation. The end result is not a coherent data track, just a disk with no readable information on it. This should be entirely doable in principle, just spin the disk, turn on the laser, and destroy the data.
Ah, that's the explanation. The burner refuses to write again. Pretty silly limitation. The application (and, ultimately, the user) should make this decision.
No, I don't have a Plextor.
Verbatim is what I actually got this time after returning the bad disks. I'll see if it makes a difference.
Aren't Taiyo Yuden pretty expensive?