Abstract: Provide a vane compressor which starts the compression without delay, and which prevents the vanes from chattering under the start-up operation. To this end, the vane compressor 1 includes: a cylinder chamber 3; a rotor 5 rotatably arranged in the cylinder chamber 3; vane grooves 7 provided in the rotor 5 at equal intervals in the circumferential direction thereof; vanes 9 arranged in the vane grooves 7 in a way that the vanes 9 are capable of protruding to, and retracting from, the cylinder chamber 3; and the vane back-pressure chamber 11 communicating with the bottom portions of the vane grooves 7, and configured to apply the back pressure to the vanes 9; and a back-pressure supplying unit 13 configured to transmit the pressure to the vane back-pressure chamber 11, and to push up the vanes to the sliding surface of the cylinder chamber 3 once the activation mode for rotating the rotor 5 is selected.

Abstract: A hard disk testing apparatus is comprised of a pair of carriages, each provided with a pair of upper and lower heads, and one of the upper and lower heads on either of the carriages is mounted on a micro adjustment carriage. With this structure, the head mounted on the fixed carriage writes a signal, and the head mounted on the carriage equipped with the micro adjustment carriage reads the signal. The structure and operation of the apparatus effectively prevent omission or duplication of testing tracks at the border between a test range of a hard disk covered by one of the pair of carriages and another test range covered by the other carriage.