A disk unit is disclosed wherein a disk inserted by a pivoting arm is loaded to the interior of the disk unit or a disk accommodated in the interior of the disk unit is unloaded to the exterior of the disk unit, the disk unit including a plurality of arms able to convey two types of disks different in diameter while supporting an outer periphery edge of each of the disks. Also provided are methods for utilizing gidB polypeptides to screen for antibacterial compounds. A movable member holding the droplet generator is coupled to stationary elements of the EUV system through a coupling system having a first subsystem that constrains lateral translation of the movable member, and a second subsystem that controls a relative inclination of the movable member. In a stored position, a first portion of the web strap is wound on the winch mandrel and a second portion of the web strap is wound in a roll on the winding past the crank. The instruction could optionally include the end-state of the bus after the operation, information about the bit count of the data to be scanned, information about the location of the data to be sent out of the JTAG port and also the location to store the received information from the test subject.