Nikon D7000 User Manual page 53

A
The Write Protect Switch
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.
A
See Also
See page 236 for information on formatting memory cards using the Format memory card
option in the setup menu.
Write-protect switch
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