Abstract: A cassette inspecting system for inspecting the function of a lid of a cassette which is urged toward the closed position by a lid spring inspects whether the urging force of the lid spring is between an upper limit and a lower limit. An arm is mounted on a base for rotation about an axis between its first and second end portions in a first direction and a second direction opposite to the first direction. The base is movable to move the arm together therewith substantially in the first direction, thereby causing the first end portion of the arm member to abut against the lid in the first direction and to urge the lid toward the open position. A balancer fixed to the second end portion of the arm urges the first end portion in the first direction with a force substantially equivalent to the lower limit of the urging force of the lid spring.

Abstract: A micro floppy disk generally includes a magnetic disk body which is flexible and is annular in shape and a hat-like center hub bonded to the center of the magnetic disk body by adhesive. The center hub has an annular flange portion and the adhesive is annularly applied to the flange portion of the center hub. Whether the adhesive is uniformly applied to the flange portion and whether the center hub is firmly bonded to the magnetic disk body largely affect the condition of recording reproduction of signals.