A foot measuring or sizing device comprising a base platform, a heel support, an alignment fin and a measurement scale. Moreover, the invention can enable monitoring of the displayed content to produce monitoring information from which conclusions may be deduced regarding the observation of the displayed content by an observer. The core portion includes an inner, annular ejector ring defining a portion of the enlarged container rim. With this structure, it is possible to efficiently use inner space of the disk drive. The state of the peripheral is analyzed using the state information extracted from the identification region received by the state-requiring device.