From the home screen, touch Settings > Device > Maintenance > Out of Service Erase.
Select the Sanitize all information on hard disk check box, and then touch ERASE.
Select a method to erase data.
Start the operation.
Note: This process can take from several minutes to more than an hour, making the printer unavailable for other tasks.
Adding a hard disk increases the printer memory and reduces the risk of losing a print job entirely.
Remove stored information to free up printer memory and avoid printing errors.