Timothy S Ellis

US Patent:

7064914, Jun 20, 2006

Filed:

Dec 22, 2004

Appl. No.:

11/020969

Inventors:

Mehmet Fatih Erden - Pittsburgh PA, US
Richard L. Keizer - Minnetonka MN, US
Alexei Hiram Sacks - Edina MN, US
Timothy Francis Ellis - Tonka Bay MN, US

Assignee:

Seagate Technology LLC - Scotts Valley CA

International Classification:

G11B 27/36
G11B 5/09
G11B 5/596

US Classification:

360 31, 360 53, 360 7701, 360 7801

Abstract:

In a method for generating a confidence level of a position error signal (PES) component that is indicative of a quality of the PES component, a PES component is generated using position signal samples of a read back signal corresponding to a servo burst pattern. Next, a noise level corresponding to noise in the read back signal is extracted using the position signal samples. A confidence level is then generated based on the PES component and the noise level. A system for performing the method includes a transformation block, a position error signal (PES) component extractor, a noise extractor, and a confidence level generator. The transformation block is configured to receive position signal samples of a read back signal corresponding to a servo burst pattern taken at a sampling frequency. A transformed domain representation of the position signal samples is then generated by the transformation block based on the sampling frequency and the servo burst pattern. The PES component extractor is configured to extract a PES component of a PES based on the position signal samples.

US Patent:

7349167, Mar 25, 2008

Filed:

Jul 27, 2005

Appl. No.:

11/190324

Inventors:

Mehmet Fatih Erden - Pittsburgh PA, US
Richard Lyle Keizer - Minnetonka MN, US
Timothy Francis Ellis - Tonka Bay MN, US
Alexei Hiram Sacks - Edina MN, US

Assignee:

Seagate Technology LLC - Scotts Valley CA

International Classification:

G11B 5/02
G11B 5/09

US Classification:

360 29, 360 51, 360 7708

Abstract:

An apparatus comprises a data storage medium having a plurality of servo sectors and a plurality of data sectors, wherein each of the servo sectors includes a phase locked loop field and a track identification field, a controller for controlling the position of a recording head with respect to the data storage medium, and a servo demodulator for recovering timing information from both the phase locked loop field and the track identification field, and for producing a timing estimate. The method performed by the apparatus is also included.