Disk drive comprising a dual read element and delay circuitry to improve read signal
AssigneeWestern Digital (Fremont), LLC
InventorsShaoping Li, Yimin Guo, Francis H. Liu, Sining Mao
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Abstract
A disk drive is disclosed comprising a disk having a plurality of data tracks, and a head actuated over the disk, the head comprising a first read element and a second read element. A data track is read to generate a first read signal emanating from the first read element and a second read signal emanating from the second read element. The first read signal is delayed in continuous time relative to the second read signal to generate a delayed read signal, and the second read signal is combined with the delayed read signal to generate a combined read signal. An estimated data sequence is detected from the combined read signal.
Claims4
A disk drive comprising:
- a disk comprising a plurality of data tracks;
- a head actuated over the disk, the head comprising a first read element and a second read element;
- and
- control circuitry operable to:
- read a data track to generate a first read signal emanating from the first read element and a second read signal emanating from the second read element;
- sample the second read signal using a clock to generate second sample values;
- synchronize the clock in response to the second sample values;
- delay the clock;
- sample the first read signal using the delayed clock to generate first sample values representing the delayed read signal;
- and
- combine the first sample values with the second sample values to generate a combined read signal;
- and
- detect an estimated data sequence from the combined read signal.
A method of operating a disk drive, the disk drive comprising a disk comprising a plurality of data tracks, and a head actuated over the disk, the head comprising a first read element and a second read element, the method comprising:
- reading a data track to generate a first read signal emanating from the first read element and a second read signal emanating from the second read element;
- sampling the second read signal using a clock to generate second sample values;
- synchronizing the clock in response to the second sample values;
- delaying the clock;
- sampling the first read signal using the delayed clock to generate first sample values representing the delayed read signal;
- and
- combining the first sample values with the second sample values to generate a combined read signal;
- and
- detecting an estimated data sequence from the combined read signal.
Dependencies are inferred from the claim text.