A digital disc player includes a main body, a lid pivotally connected to the main body, and a latch mounted on the main body. In order to compensate for differential expansion between the metal axial support element and the cylindrical shell made of thermostructural composite material, radial clearance is provided with the axial support element and the cylindrical shell. The assays may be further multiplexed in that several samples may be analyzed and visualized on the same microelectronic array. At an exit point, fields of the saved non-head fragments are overwritten with information that was recorded for the head fragment. A conductive layer disposed over the first insulating layer and over top surfaces of the first and second fins.