Nikon D800 User Manual (en)

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Format the Memory Card
Memory cards must be formatted before first use or after being 
used or formatted in other devices.
1
Turn the camera on.
2
Press the 
I (Q) and O 
(
Q) buttons.
Hold the 
I (Q) and O (Q) 
buttons down simultaneously 
until a blinking 
C (format) 
appears in the shutter-speed 
displays in the control panel 
and viewfinder. If two 
memory cards are inserted, 
the card to be formatted is 
shown by a flashing icon. By 
default, the primary card slot 
(
0 89) will be selected; you 
can choose the secondary slot 
by rotating the main 
command dial. To exit without formatting the memory card, 
wait until 
C stops blinking (about six seconds) or press any 
button other than the 
I (Q) and O (Q) buttons.
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 (
O (Q) button
I (Q
button