In accordance with the present invention, a carriage assembly for carrying readwrite heads into engagement with a recording medium is provided. The meter cover blocks substantially an entirety of the opening and the second portion prevents the cover from being displaced within the opening. the first chamber has a planar member disposed horizontally intermediate the top edge and the bottom surface. If the device has a non-program consumable installed, the customer computer notifies the account manager system and may warn the customer that continued usage may void one or more warranty extensions or other program incentive. A voltage is determined based on the level of a reference voltage.