US 11,790,949 B2
Data storage device integrating wedge repeatable runout (WRRO) learning into data recovery procedure (DRP)
Jim French, Billings, MT (US); Austin Striegel, Rochester, MN (US); Gary Herbst, San Jose, CA (US); and Chuanwen Ji, Irvine, CA (US)
Assigned to Western Digital Technologies, Inc., San Jose, CA (US)
Filed by Western Digital Technologies, Inc., San Jose, CA (US)
Filed on Mar. 2, 2022, as Appl. No. 17/685,184.
Prior Publication US 2023/0282237 A1, Sep. 7, 2023
Int. Cl. G11B 20/18 (2006.01); G11B 27/36 (2006.01); G11B 21/10 (2006.01)
CPC G11B 21/106 (2013.01) 18 Claims
OG exemplary drawing
 
1. A data storage device comprising:
a disk comprising a plurality of data tracks and a plurality of servo wedges, wherein the plurality of servo wedges comprise a plurality of wedge repeatable runout (WRRO) fields configured to store a plurality of WRRO compensation values in connection with the plurality of data tracks;
a read-write head configured to be actuated over the disk; and
a controller configured to:
gather position error signal (PES) data needed for computation of the WRRO compensation values during a field operation of the data storage device during a data recovery procedure (DRP) that is invoked when an error condition occurs, and
adjust a position of the read-write head based on the WRRO compensation values.