Nikon D5 - Manual (Page 105)

105
To begin formatting, choose a memory card
slot and select Yes. Note that formatting
permanently deletes all pictures and other data
on the card in the selected slot. Before
formatting, be sure to make backup copies as
required.
Choose a language for camera menus and messages.
Format Memory Card
G button
➜ B setup menu
D
During Formatting
Do not turn the camera off or remove memory cards during formatting.
A
Two-Button Format
Memory cards can also be formatted by pressing the O (Q) and S (Q)
buttons for more than two seconds.
Language
G button
➜ B setup menu