Nikon D3 - Manual (Page 97)

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d
Slot 2
Use the [Slot 2] option in the shooting menu (pg. 290) to choose
the role played by the memory card in slot 2.
D
Backup/RAW Slot 1-JPEG Slot 2
When the above options are selected, the shutter-release will be disabled
when either of the memory cards is full. The viewfinder and top control
panel show the number of exposures remaining on the card with the least
amount of available memory. Voice memos (pg. 250) are appended to the
copy recorded to the memory card in slot 1.
Option Rear control panel Description
X
Overflow
(default)
The memory card in slot 2 is
used to record photographs
when the memory card in slot
1 is full.
Y
Backup
Each photograph is recorded
to both memory cards.
Z
RAW Slot 1-
JPEG Slot 2
At image quality settings of
NEF (RAW)+JPEG, the NEF
(RAW) image is recorded to
the memory card in slot 1, the
JPEG image to the memory
card in slot 2. At other image
qualities, this option is the
same as [Backup].