Abstract: A personal identification medium enables easily confirming specific information. A time and attendance management system and a customer information management system both use the personal identification medium. An individual information storage unit 41 stores personal information related to an individual. A display 35 displays the personal information. A communication unit 31 receives predetermined information by wireless communication from an external device 3 installed in a specified location. The display 35 displays or stops displaying the personal information when triggered by reception of the predetermined information when entering or leaving the specified location.

Abstract: A disk drive apparatus for recording and reproducing desired information on and from floppy disks, is simply and thinly structured and has an excellent shock resistance. The disk unit includes a support for carrying a pair of heads for pinching a magnetic disk from both sides thereof and for reading and writing information thereon supported on respective carriages that can move the pair of heads to a desired track on the disk, and a holder, supported by the support, for storing a disk cartridge. The holder is provided with a head guard movable between a guarding position where the head guard is inserted between the pair of heads to prevent the pair of heads from abutting each other and a withdrawn position where the head guard is withdrawn from between the pair of heads, and a spring for urging and moving the head guard to the guarding position.