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AssigneeMarvell International Ltd.
InventorsBudi Santoso, Zhimin Yuan, Siang Huei Leong, Chun Lian Ong, Pantelis Alexopoulos
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Methods and architecture for monitoring hard disk drive operation is provided. The hard disk drive system provided includes a spindle, a head and a disk with a disk medium including a buried servo layer having a first frequency of data on a first track and a second frequency of data on a second track, the second track adjacent to the first track. The method includes the steps of writing a wide track pattern having a predetermined frequency on a track of a hard disk drive medium, generating a readback signal by reading the pattern from the track, processing the readback signal by mixing the readback signal with a reference signal to obtain a mixed signal having a summed signal and a difference signal, and filtering the mixed signal by a filter centered around the difference signal to generate a measurement signal corresponding to a relative speed change of the spindle and a head-to-disk motion. In addition, filtering a readback signal generated by the head when positioned at the middle of the first track and the second track with a first filter centered at the first frequency and a second filter centered at the second frequency is used to generate signals for determining spindle speed variation, spindle speed jitter, and relative head-disk vibration in the downtrack direction, for synchronizing writing in Two Dimensional Magnetic Recording (TDMR) and for measuring continuous flying height information based on Wallace equations.
A method for monitoring hard disk drive operation in a hard disk drive system including a disk having a hard disk medium on a surface thereof and being rotated by a spindle coupled thereto, the hard disk drive system further including a head for writing to and reading from the hard disk medium, the method comprising:
A method for monitoring operation of a hard disk drive system having a disk medium including a buried servo layer having a first frequency of data on a first track and a second frequency of data on a second track, the second track adjacent to the first track, the method comprising:
A method for measuring a relative change of flying height of a head over a disk medium in a hard disk drive (HDD) system, wherein the disk medium includes a buried servo layer having a first frequency of data on a first track and a second frequency of data on a second track, the second track adjacent to the first track, the method comprising:
Dependencies are inferred from the claim text.