Nikon Z9 Mirrorless Camera - Manual (Page 708)

708 B The Setup Menu: Camera Setup
Format memory cards. To begin formatting,
choose a memory card slot and select [
Yes ].
Note that formatting permanently deletes all
pictures and other data on the card.
Before
formatting, be sure to make backup copies as
required.
D Caution: During Formatting
Do not turn the camera off or remove memory cards until the message
[
Formatting memory card ] clears from the display.
A The Format Buttons
Keeping both format ( O / Q and S / Q ) buttons pressed for over two
seconds displays a dialog prompting you to select a card for formatting.
Choose a language for camera menus and messages. The languages
available vary with the country or region in which the camera was
originally purchased.
Format Memory Card
G button
U B setup menu
Language
G button
U B setup menu