Patent ID: 7542230
Filing Date: 2009-06-02
Classification: G11B

Abstract:
1. A disk drive, comprising: a disk that includes a reference pattern and tracks, wherein the reference pattern includes servo information and the tracks include servo sectors, and embedded runout correction (ERC) values compensate for repeatable runout (RRO) in the tracks; a transducer that reads data from and writes data to the disk; and a controller that (1) generates a position error signal (PES) using the transducer to read the reference pattern while the transducer is at a radial position, (2) self-writes a servo burst on the disk using the transducer while using the PES to position the transducer at the radial position, wherein the PES indicates the RRO for the servo burst and the transducer remains positioned at the radial position between reading the reference pattern and self-writing the servo burst, (3) calculates an ERC value for the servo burst using the PES, and (4) writes the ERC value to the disk using the transducer; wherein the controller also (1) generates a second PES using the transducer to read the reference pattern while the transducer is at a second radial position, (2) self-writes a second servo burst on the disk using the transducer while using the second PES to position the transducer at the second radial position, wherein the servo bursts are radially offset, circumferentially staggered servo bursts, and the second PES indicates RRO for the second servo burst, and (3) calculates the ERC value for the servo bursts using the PES's; and wherein the controller (1) generates the PES and self-writes the servo burst during a first revolution of the disk, and (2) generates the second PES and self-writes the second servo burst during a second revolution of the disk.