D600 copy from Slot 2 to 1
the D800 has a copy images option in the playback menu, which i've never even seen before your question piqued my curiosity. i don't know if the D600 also supports this function, or whether it will work as you desire. still, at a quick glance it looked promising. until now, i probably would've answered no to your question...
|Ruby Red Dress by cjf2|
from High key portrait with RED
|Follow me home by eaa|
from Shades of Blue in Nature