Nikon D610 User Manual page 58

A
The Write Protect Switch
SD memory cards are equipped with a write protect
switch to prevent accidental loss of data. When this switch
is in the "lock" position, the memory card can not be
formatted and photos can not be deleted or recorded (a
warning will be displayed in the monitor if you attempt to
release the shutter). To unlock the memory card, slide the
switch to the "write" position.
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See Also
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See page 250 for information on formatting memory cards using the Format memory card
option in the setup menu.
32
Write-protect switch