An apparatus and method for increasing the data storage capacity of a data storage device 100 having media surfaces 23. A guide on at least one of the tamping tool levers is provided for displacing the tamping pick in a direction extending perpendicularly to the pivot axis of the at least one tamping tool lever, and a fixing device is provided for fixing the tamping pick on the lower tamping tool lever end. The shower plate includes processing gas supply passageways which allow the processing gas introduction space to communicate with the processing space. A high capacity toroidal tub drain conducts water from the tub into the reservoir by gravity alone very quickly. Further, it is possible to curtail the use of high-performance equipment or manpower and time required in a measurement process.