Nikon D300 User Manual page 161

The camera can store up to five values for preset white balance in
presets d-0 through d-4. A descriptive comment can be added to
any white balance preset (pg. 144).
d-0
Stores last value measured for
white balance (pg. 136). This
preset is overwritten when a
new value is measured.
d-1–d-4
Store values copied from d-0 (pg. 139).
Store values copied
from images on
memory card (pg. 140).
A
White Balance Presets
Changes to white balance presets apply to all shooting menu banks
(pg. 255). A confirmation dialog will be displayed if the user attempts to
change a white balance preset created in another shooting menu bank
(no warning is displayed for preset d-0).
r
135