Patent ID: 7006322
Filing Date: 2006-02-28
Classification: G11B

Abstract:
1. A method of self-servo writing in a disk drive that has a head and a disk-shaped medium, the head having a write-head element and a read-head element, the method comprising: (a) reading positioning servo data recorded on the disk-shaped medium by using the read-head element; (b) positioning the write-head element at a desired track provided on the disk-shaped medium, by using the positioning servo data read by the read-head element; (c) recording measuring servo data in the desired track by using the write-head element, the measuring servo data including same position information as that of the positioning servo data; (d) positioning the read-head element at the desired track by using the positioning servo data read by the read-head element; and (e) reading the positioning servo data and the measuring servo data, both read by the read-head element; (f) obtaining two position errors from, respectively, the positioning servo data and the measuring servo data, both read by the read-head element; and (g) calculating a position offset between the read-head element and the write-head element, from the two position error data.