Nikon D800 User Manual (en)

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Press the 
I (Q) and O (Q) buttons again.
Press the 
I (Q) and O (Q) 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.