Your RX02s are
broken!
I suspected thay'd been "fixed", but I don't think it's a
malfunction. All three sets came from the same company and all three
write to disks with the notch open.
No, I think they're working fine. I've just read the RX02 printset, and
there's mo mention of a write-protect sensor. My guess is that these
drives ignore the notch.
-tony