Nikon D90 - Manual (Page 50)

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❚❚Formatting Memory Cards
Memory cards must be formatted after being used in other devices. Format the card
as described below.
D Formatting Memory Cards
Formatting memory cards permanently deletes any data they may contain. Be sure to copy any
photographs and other data you wish to keep to a computer before proceeding (pg. 148).
1
Turn the camera on.
2
Press the Q buttons.
Hold the Q (Z and O) buttons down
simultaneously for approximately two
seconds.
A blinking C will appear in the shutter-
speed displays in the control panel and
viewfinder. To exit without formatting the
memory card, wait six seconds (the default
setting) until
C stops blinking or press any
button other than the Q (Z and O) buttons.
3
Press the Q buttons again.
Press the Q (Z and O) buttons together a second time while C is blinking
to format the memory card. Do not remove the memory card or remove or
disconnect the power source during formatting.
When formatting is complete, the control panel and
viewfinder will show the number of photographs that
can be recorded at current settings.
Power switch
O button Z button