Thomas P Rasmussen

US Patent:

7154699, Dec 26, 2006

Filed:

Dec 31, 2001

Appl. No.:

10/039063

Inventors:

Pradeep K. Subrahamanyan - Hillsboro OR, US
Patrick J. Korkowski - Savage MN, US
Waleed A. Farahat - St. Louis Park MN, US
Steven C Ehret - Inver Grove Heights MN, US
Gregg J. Severson - Prior Lake MN, US
Thomas S Rasmussen - Kasson MN, US
Albert Van der Schans - Minnetonka MN, US
Alexei H. Sacks - Edina MN, US
James H. McGlennen - Eden Prairie MN, US

Assignee:

Seagate Technology LLC - Scotts Valley CA

International Classification:

G11B 5/596

US Classification:

360 7702

Abstract:

A high bandwidth, large stroke spin-stand for testing components of a disc drive includes a coarse positioning stage and a rotary micropositioning stage. The spin-stand is capable of positioning a transducer head relative to the data storage disc based on one or both of: (1) an angular position of a rotary actuator arm in the rotary micropositioning stage; and (2) servo data read from the data storage disc. The angular position of the rotary actuator arm is detected by an encoder. In one embodiment, position adjustments are based on the detected angular position. In another embodiment, position adjustments are based on servo data read from the data storage disc, but are also conditional on angular position being consistent with the servo data. In yet another embodiment, both angular position and servo data from a track are linearized to generate PES adjustment parameters that are recorded on the data storage disc to redefine the track as more circular or to linearize the PES.