Abstract: An inspection device or inspection method for a magnetic head or magnetic disc which can form a servo pattern applicable to a write system, and a magnetic disc recording device or magnetic disc recording method. In inspection or recording of a magnetic disc, which rotates the magnetic disc, a servo pattern is written into a servo pattern region of the magnetic disc by a write-in element of a magnetic head, and is read by a read-in element of the magnetic head. Servo following of a position of the magnetic head on the magnetic disc is performed based on the servo pattern which comprises a plurality of patterns. The patterns are written-in with a first frequency for causing the patterns to be subjected to the servo following and, the patterns are overwritten with a second frequency different from the first frequency, except a servo following width used in the servo following.

Abstract: Provided are magnetic read-write inspection apparatus and inspection method allowing measurement and inspection again by a sector servo system even when a magnetic disk measured and inspected by the sector servo system is detached from the inspection apparatus and re-mounted. A data write unit writes a servo pattern signal in a predetermined track range of the disk, writes an inspection test pattern signal onto an inspection track by performing sector-servo-system-based positioning and concentrically writes an eccentricity learning pattern onto an eccentricity learning track which is different from the inspection track. An eccentric quantity learning unit calculates an eccentric quantity of the disk from a read signal detection position by reading out the eccentricity learning pattern without using servo information. An eccentric quantity correction unit controls shaking of a magnetic head so as to cancel the calculated eccentric quantity when reading out a test signal from the disk.

Abstract: An inspection apparatus and method for a magnetic head or a magnetic disk is conducted using a two-carriage method. In particular, the magnetic disk is rotated by a spindle, a test signal is written into the magnetic disk by one magnetic head mounted in one carriage which moves in the radius direction of the magnetic disk, and the test signal of the magnetic disk is read by the other magnetic head mounted in the other carriage which moves in the radius direction of the magnetic disk to inspect the performance of the magnetic head or the magnetic disk using the read signal. The sector pulses to determine servo timing at which servo burst signals preliminarily written into the disk are read are formed on the basis of a clock signal and an index signal generated along with the rotation of the spindle.

Abstract: An inspection device or inspection method for a magnetic head or magnetic disc which can form a servo pattern applicable to a write system, and a magnetic disc recording device or magnetic disc recording method. In inspection or recording of a magnetic disc, which rotates the magnetic disc, a servo pattern is written into a servo pattern region of the magnetic disc by a write-in element of a magnetic head, and is read by a read-in element of the magnetic head. Servo following of a position of the magnetic head on the magnetic disc is performed based on the servo pattern which comprises a plurality of patterns. The patterns are written-in with a first frequency for causing the patterns to be subjected to the servo following and, the patterns are overwritten with a second frequency different from the first frequency, except a servo following width used in the servo following.