Data storage device optimization based on adjacent track interference
AssigneeSeagate Technology LLC
InventorsWenzhong Zhu, Alfredo Chu, SiewKin Chow
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Abstract
Systems, devices, processes, and methods of optimizing a data storage device based on adjacent track interference (ATI) are presented. ATI can be detected by writing a specific track of a disc a number of times and measuring a bit error rate (BER) of an adjacent track. In addition, more accurate in-field simulations of ATI can be achieved by seeking to another track, such as an adjacent track, in-between each write to the specific track. Further, in a heat-assisted magnetic recording (HAMR) device, a laser bias control can be implemented during at least one of the seeks to calibrate a laser in-between each write. Even further, the seeks may be anticipatory track seeks (ATS).
Claims20
An apparatus comprising:
- a write head adapted to write multiple data tracks of a data storage disc;
- a controller coupled to the write head and configured to perform a calibration process including:
- seeking the write head to an adjacent track of a target track;
- after the seek to the adjacent track, seeking the write head to the target track and writing the target track;
- repeating seeking to an adjacent track and writing the target track until a threshold number of writes to the target track have been reached;
- after the threshold number of writes are reached, measuring an error rate of an adjacent track;
- and
- determining a setting corresponding to the data storage disc based on the error rate.
A device comprising:
- a circuit adapted to couple to a write head corresponding to a data storage medium having multiple tracks for data storage, the circuit configured to perform a calibration process corresponding to the data storage medium including:
- seeking to an adjacent track adjacent to a target track;
- seeking to the target track;
- writing the target track;
- repeating seeking to the adjacent track, seeking to the target track, and writing the target track until a threshold number of writes are met;
- and
- after the threshold number of writes are met, measuring an error rate of the adjacent track;
- and
- determining an adjacent track interference threshold corresponding to the data storage medium based on the error rate.
A memory device storing instructions that, when executed, cause a processor to perform a method comprising:
- performing a target track write process including:
- seeking a write head of a data storage device to an adjacent track to a target track;
- seeking the write head to the target track;
- writing the target track;
- repeating the target track write process until the target track has been written a number of times;
- and
- after the target track has been written a number of times, determining a configuration of the data storage device based on a measurement of the adjacent track.
Dependencies are inferred from the claim text.