On the back panel of the device, there is a Reset button. It is recessed to prevent accidental resets (you need a pointed object to press this button).
The actions that are performed when the Reset button is pressed are defined on the Encryption & Share page. See Encryption & Share in online help.
Note: It is recommended that you save the audit log prior to performing a factory reset.
The audit log is deleted when a factory reset is performed and the reset event is not logged in the audit log. For more information about saving the audit log, see Audit Log.