Nikon D300 - Manual (Page 338)

312
U
Format Memory Card
Format the card. 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 more than two seconds (pg. 41).
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.