Nikon D750 DSLR Camera (Body Only) - Manual (Page 22)

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Disposing of Data Storage Devices
Please note that deleting images or formatting memory cards or other data
storage devices does not completely erase the original image data. Deleted
files can sometimes be recovered from discarded storage devices using
commercially available software, potentially resulting in the malicious use of
personal image data. Ensuring the privacy of such data is the user’s
responsibility.
Before discarding a data storage device or transferring ownership to another
person, erase all data using commercial deletion software, or format the
device and then completely refill it with images containing no private
information (for example, pictures of empty sky). Be sure to also replace any
pictures selected for preset manual (
0 162). Before discarding the camera or
transferring ownership to another person, you should also use the Wi-Fi >
Network settings > Reset network settings ( 0 288) and Network >
Network settings options in the camera setup menu to delete any personal
network information. For more information on the Network menu, see the
documentation provided with the optional communication unit. Care should
be taken to avoid injury when physically destroying data storage devices.