At the start of a backup operation, the controller of a disk array apparatus makes a copy of an address translation table and searches for a valid logical address based on the copy. The flip-chip type integrated circuit chip includes a distributed transistor, and first and second pluralities of flip-chip interconnects connected to source and drain regions, respectively. The upward migration of components of the substance to be analyzed can thus be started without changing the position of the thin layer plate for this purpose. A door is mounted to the housing for movement between a latched position, capturing the cassette between the panel and the door, and a released position.