When you give the printer to someone else or dispose of it, erase all the personal information stored in the printer's memory by selecting the menus on the control panel as described below.
Settings > General Settings > System Administration > Restore Default Settings > Clear All Data and Settings
Settings > General Settings > System Administration > HDD Erase Settings > Erase All Memory > High Speed, Overwrite, or Triple Overwrite
Data on the HDD can be completely erased by High Speed.
Overwriting it once is enough to erase the data on the HDD.
To overwrite to an additional level, select Triple Overwrite.
The Overwrite or Triple Overwrite function overwrites any invalid data in the memory which can take some time to process.
Settings > General Settings > System Administration > Clear Internal Memory Data > PDL Font, Macro, and Working Area