公开(公告)号：US09875763B1

公开(公告)日：2018-01-23

申请号：US15332475

申请日：2016-10-24

Applicant: Seagate Technology LLC

Inventor： Jason C. Jury ,  Siong Liu ,  Joshua W. Christensen

IPC: G11B5/596 ,  G11B20/18 ,  G11B20/12

CPC classification number: G11B5/59627 ,  G11B5/59688 ,  G11B20/1816 ,  G11B2020/183

Abstract: Method and apparatus for recovering user data from a rotatable data recording medium. In some embodiments, a moveable read element detects at least one uncorrectable read error in user data stored in a data sector arranged along a concentric track. A read retry operation is carried out to recover the user data by radially advancing the moveable read element from a first offset value to a different second offset value with respect to the track in accordance with a trajectory profile while transducing the user data from the data sector. This allows data that are variably overwritten (encroached upon) by different radial amounts from an adjacent track to be recovered.