Using readback signals to estimate radial location on a...

Details Using readback signals to estimate radial location on a... Using readback signals to estimate radial location on a...

2011-06-14

2011-06-14

Sniezek, Andrew L (Department: 2627)

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data clocking

C360S077080, C360S031000, C360S075000

Reexamination Certificate

active

07961416

ABSTRACT:
Approaches for estimating the operating radius of a head in a hard-disk drive. These approaches may be used in a constant or approximately constant density servo scheme. Statistics, which describe the proportion of high frequency values to low frequency values in a readback signal read by the read/write head of a persistent storage medium, such as a hard-disk drive (HDD), are maintained. An estimated location for the read/write head using the statistics is determined. The estimated location may be expressed as an estimated operating radius, which is an estimated distance from the center of the magnetic-recording medium to a current position of the read/write head. Based on the estimated location of the read/write head, an estimated clock frequency for a readback channel to use in reading the servo data stored on the magnetic recording medium is determined. The readback channel reads the servo data using the estimated clock frequency.

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Eaton, R. et al., Imaging of media lubricant spacing contributions by readback signal analysis, IEEE Transactions on Magnetics, Pub Date Jan. 97, vol. 33, Issue 1, Abstract.

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