Hi, the only way I know to erase netmd is to use an walkman or deck who has the "blankdisc" problem. I have an old mz-r900, completely broken for play and record, but because he is broken for recording and didn't save TOC properly, it erase entire netmd. I keep it especially for that instead to throw it. How to do it: Insert the netmd in player,go to end (end search) then record 4 or 5 seconds,Stop, and wait for TOC edit is complete,Eject and re-insert de md,The minidisc is blank. It could be handy to buy or find an old and very tired walkman/recorder (ask internet or friends), open it and cut the head that write TOC.