Nikon Df - Manual (Page 17)

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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 90). Care should be taken to avoid injury when physically
destroying data storage devices.