Nikon D6 Reference Manual page 783

Delete
Delete multiple images. For more information, see "Deleting
Multiple Pictures" ( 0 431).
Option
[Selected
Q
images]
[Candidates
d
for deletion]
[Images shot
i
on selected
dates]
R [All images]
Delete selected pictures.
Delete pictures rated d (candidate for deletion).
Delete all pictures taken on selected dates.
Delete all pictures in the folder currently selected
for [Playback folder] in the playback menu.
•
If two memory cards are inserted, you can select
the card from which pictures will be deleted.
D The Playback Menu: Managing Images
G button U D playback menu
Description
731