Nikon D3 - Manual (Page 371)

345
U
Format Memory Card
Format the card in the selected slot. Note that formatting
permanently deletes all pictures and other data on the card. Before
formatting, be sure to make backup copies as required.
D
During Formatting
Do not turn the camera off or remove memory cards during formatting.
A
Two-Button Format
Memory cards can also be formatted by pressing the Q (O and I)
buttons for about two seconds (pg. 45).
LCD Brightness
Press 1 or 3 to choose from seven settings
for monitor brightness. Choose higher
values for increased brightness, lower values
for reduced brightness.
Lock Mirror up for Cleaning
Lock the mirror in the up position to allow inspection or manual
cleaning of the low-pass filter that protects the camera image
sensor (pg. 395).