Philips HDRW720/69 Operating Instructions Manual page 80

PROBLEM SOLUTION
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1 Open the disc tray with OPEN/CLOSE J . Insert the disc but do not close the tray.
2
Hold down the number button 2 on the remote control until the tray closes. The disc is
modified.
3
You can restore the disc to its original condition by pressing 1 .
There is a risk that you can no longer play the disc on other DVD players after this procedure.
Therefore, apply this function with particular care.