Patent ID: 8107180
Filing Date: 2012-01-31
Classification: B82Y,G11B

Abstract:
1. A hard-disk drive comprising: a magnetic-recording disk including tracks on which a plurality of patterned bit-cells that are isolated magnetically from each other are aligned at predetermined alignment pitches; a magnetic-recording head which is configured to follow tracks and to write and to read data; a signal-processing unit which is configured to generate a recording signal based on a write-clock signal with cycles corresponding to said alignment pitches of said patterned bit-cells, and to output said recording signal to said magnetic-recording head; a phase-detecting unit which is configured to detect a phase of said write-clock signal when said magnetic-recording head reaches an end point of a predetermined range including a range into which data are written by said magnetic-recording head in said tracks, wherein the predetermined range is approximately half the alignment pitches of said patterned bit-cells; and a determination-processing unit which is configured to determine success of data writing based on a difference between an expected value and a detected value of said phase of said write-clock signal when said magnetic-recording head reaches said end point of said predetermined range, without requiring the performance of a verification process.