To prevent a file from being accidentally erased or edited, you can protect an important file. A protected file is marked with the
(protect) indicator and is regarded as a read-only file you cannot erase or edit.
PLAY/STOP・ENTER.

or
+ to select “ON,” and then press
PLAY/STOP・ENTER.
(protect) indicator.
(stop) to exit the menu mode.
PLAY/STOP・ENTER.