Seagate Technology Incorporated

Seagate Technology International

Hwa Jun Kim

Jung Min Yoon

Jae Myung Chung

Jungho Lee

Je-Hong Yoo

Systems and methods are disclosed that implement asymmetrical write fault thresholds. A data storage device may apply a different write fault threshold to each side of a target track, allowing a write head to deviate from a track center more in one direction than in the other direction. In some embodiments, the asymmetrical write fault thresholds may be applied to shingled tracks, allowing a lower write fault threshold to be applied in the direction of previously written shingled tracks, and a higher write fault threshold to be applied in the direction of tracks which are not yet written.

Asymmetrical write fault thresholds

In a method of determining an iteration value for an iterative decoding process of a hard disk drive, a bit error rate (BER) of a digital signal is measured in multiple iterations. A difference is calculated between BERs of consecutive iterations, and the calculated differences are compared with a reference value. An adjusted iteration value is then determined based on the comparison.

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Hwaseong-si, South Korea

Hwa Jun Kim