| US 7,589,927 B2 | ||
| Dynamically adapting a read channel equalizer | ||
| Robert Allen Hutchins, Tucson, Ariz. (US); Sedat Oelcer, Kilchberg (Switzerland); Jens Jelitto, Rueschlikon (Switzerland); and Evangelos S. Eleftheriou, Zurich (Switzerland) | ||
| Assigned to International Business Machines Corporation, Armonk, N.Y. (US) | ||
| Filed on Aug. 30, 2005, as Appl. No. 11/215,409. | ||
| Prior Publication US 2007/0047127 A1, Mar. 01, 2007 | ||
| Int. Cl. G11B 5/35 (2006.01) | ||
| U.S. Cl. 360—65 [360/46; 360/55; 360/77.12] | 9 Claims |
| 5. A storage drive for performing Input/Output (I/O) operations with respect to a storage medium coupled to the storage drive,
comprising:
a head to read data from the storage medium; and
a read channel in data communication with the head to process signals the head reads from the storage medium, comprising:
an equalizer equalizing input read signals to produce equalizer output signals;
a detector sensing an adjusted equalizer output signal to determine an output value comprising data represented by the input
read signals;
an equalizer adaptor receiving the output value from the detector and a first input signal representing the equalizer output
signal before being sensed by the detector to determine a first error signal used to adjust the equalizer operations;
a first component adjusting the equalizer output signals to produce adjusted equalizer output signals transmitted to the detector,
wherein the first component is adjusted by a second error signal; and
a second component calculating the second error signal from the output value from the detector and a second input signal representing
one of the adjusted equalizer output signals before being sensed by the detector, wherein the first and second input signals
are different and are adjusted by different components in a signal path between the equalizer and the detector, wherein the
first and second error signals are different.
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