Nikon D6 Reference Manual page 1172

Memory Card Capacity
The following table shows the approximate number of pictures
that can be stored on a 128 GB
image quality, and image size settings. Actual capacity varies
with shooting conditions and the type of card.
[FX (36 × 24)] Selected for Image Area
This category also includes images taken with non-DX lenses
when [On] is selected for [Image area] > [Auto DX crop].
Image quality
NEF (RAW), Lossless
compressed, 12-bit
NEF (RAW), Lossless
compressed, 14-bit
NEF (RAW),
Compressed, 12-bit
NEF (RAW),
Compressed, 14-bit
1120 Memory Card Capacity
1
card at different image area,
Image
File size
size
Approx.
Large
20.2 MB
Approx.
Medium
14.6 MB
Approx.
Small
11.1 MB
Approx.
Large
25.1 MB
Approx.
Large
18.4 MB
Approx.
Large
22.6 MB
Number of Buffer
exposures capacity
remaining 2
3500 frames
frames
4700 frames 79 frames
6200 frames 84 frames
3000 frames
frames
4700 frames
frames
3900 frames
frames
2, 3
184
146
186
152