Abstract: An animal body identifying device of the present invention includes a camera for photographing an eye of an animal, a body data capturer for capturing body data for the photographed animal from an image photographed by the camera, a body data registry for pre-storing a plurality of body data and a body data collator for correlating body data stored in the body data registry with body data captured by the body data capturer and identifying whether or not the photographed animal is a registered animal. An animal body identifying system of the present invention includes a body data capturing device for photographing an eye of an animal and capturing body data for the animal and a body data comparing device for collating body data obtained from the body data capturing device with pre-registered body data and determining whether or not the photographed animal is a registered animal.

Abstract: In a magnetic disk drive device comprises a magnetic disk having a plurality of concentric tracks on a data surface on which data are recorded. At least one of the tracks serves as a shipping area. Dedicated data is written in each of the data sectors in the shipping area and a DC erase section is formed in one of the data sectors in the shipping area. The dedicated data and the DC erase section are detected at the time of starting the rotation of the magnetic disk, and the speed of the disk is measured on the basis of the data thus obtained. The speed as obtained from the above data is monitored to determined when it has reached a predetermined value.