Sony MD Walkman MZ-R55 Operating Instructions Manual page 63

TrPROTECT :
You tried to record over or edit a track
which has been protected from being
2)
recorded over.
1)
If you have recorded or erased many times on
the same MD, the data of a single track may be
scattered throughout the MD. When the data is
scattered in groups of less than 12 seconds
long, the recorder will not be able to combine
the tracks.
2) Track-protected MiniDiscs — Some MD
recorders will let you protect individual tracks
from being recorded over. This recorder,
however, does not offer this feature.
EDITING
You pressed a key on the recorder
while editing on the remote control, or
vice versa.
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