Canon TX-4100 Online Manual page 259

It is virtually impossible to recover the overwritten data.
Conforms to the DoD5220.22-M standard of the U.S. Department of Defense.
Secure (VSITR)
Overwrites the entire hard disk with 00 next overwrites with FF after the data encryption key
specified for the hard disk drive is erased.
After repeating this process three times, the entire hard disk is overwritten with AA.
It is virtually impossible to recover the overwritten data.
Conforms to the guidelines of German Federal Government (VS-ITR).
• • Data deletion
Selects the method to delete data on printer's hard disk.
Erasing Data on Printer's Hard Disk
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