Patent ID: 6696831
Filing Date: 2004-02-24
Classification: G01R,G11B

Abstract:
A testing apparatus for one of a magnetic head and a magnetic disk, comprising:a magnetic disk which rotates at a predetermined constant rotational speed; a magnetic head moving mechanism which holds a magnetic head and which moves the magnetic head to a predetermined position in a radial direction of the magnetic disk; a movement mechanism control device for driving the magnetic head moving mechanism, wherein said movement mechanism control device moves said magnetic head moving mechanism to a predetermined radial position corresponding to position data referenced from position data from movement of the head in the radial direction and position data embedded in the surface of the magnetic disk; a read/write control device for writing a predetermined magnetic signal on the magnetic disk using the magnetic head, and for reading a magnetic signal of the magnetic disk using the magnetic head; and a memory for storing therein position data embedded in a data surface of said magnetic disk, extracted from the magnetic signal which is read by the read/write control device, for storing an actual writing position, per sector of said magnetic disk, at the time of writing said predetermined magnetic signal by said read/write control device, and for storing an actual reading position, per said sector of said magnetic disk, at the time of reading said magnetic signal of the magnetic disk; and a device for calculating a difference between said actual reading position and said actual writing position in order to obtain a read/write offset, a write width, and a read width.