Nikon D6 User Manual With Warranty page 285

D 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). Care should be
taken to avoid injury when physically destroying data storage devices.
Before discarding the camera or transferring ownership to another
person, you should also use the [Reset all settings] item in the camera
setup menu to delete network settings and other personal information.
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