DISK DRIVE EMPLOYING MULTIPLE READ ELEMENTS TO INCREASE RADIAL BAND FOR TWO-DIMENSIONAL MAGNETIC RECORDING
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Abstract
A disk drive is disclosed comprising a disk comprising a plurality of tracks, and a head comprising at least three read elements including a first read element, a second read element, and a third read element. When the head is within a first radial band of the disk, data recorded on the disk is detected using the first read element and the second read element. When the head is within a second radial band of the disk different from the first radial band, data recorded on the disk is detected using the first read element and the third read element. The first read element is substantially aligned down-track with the third read element when the head is over a first radial location of the disk.
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Citations
35 Claims
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3. (canceled)
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9. A disk drive comprising:
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a disk comprising a plurality of tracks; a head comprising at least two read elements; and control circuitry configured to; when the head is within a first radial band of the disk, detect data recorded on the disk by processing a first read signal generated by the first read element and by processing a second read signal generated by the second read element using a two-dimensional demodulation algorithm; and when the head is within a second radial band of the disk different from the first radial band, detect data recorded on the disk by processing the first read signal using a one-dimensional demodulation algorithm. - View Dependent Claims (10, 11, 12, 13)
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14. A method of operating a disk drive, the method comprising:
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when a head is within a first radial band of a disk, detecting data recorded on the disk using a first read element and a second read element; and when the head is within a second radial band of the disk different from the first radial band, detecting data recorded on the disk using the first read element and a third read element, wherein when the head is over a first radial location of the disk the first read element is substantially aligned down-track with the third read element and the second read element is offset radially from the first read element and the third read element by at least half a width of the second read element. - View Dependent Claims (15, 17, 18, 19, 20, 21)
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16. (canceled)
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22. A method of operating a disk drive, the method comprising:
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when a head is within a first radial band of a disk, detecting data recorded on the disk by processing a first read signal generated by the first read element and by processing a second read signal generated by the second read element using a two-dimensional demodulation algorithm; and when the head is within a second radial band of the disk different from the first radial band, detecting data recorded on the disk by processing the first read signal using a one-dimensional demodulation algorithm. - View Dependent Claims (23, 24, 25, 26)
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27. A disk drive comprising:
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a disk comprising a plurality of tracks; a head comprising at least three read elements including a first read element, a second read element, and a third read element; and control circuitry configured to; select the first read element and the second read element to detect first user data recorded on the disk when the head is at a first radial location over the disk, wherein the third read element is not used to detect the first user data; and select the second read element and the third read element to detect second user data recorded on the disk when the head is at a second radial location over the disk different from the first radial location, wherein the first read element is not used to detect the second user data. - View Dependent Claims (1, 2, 4, 5, 6, 7, 8, 28, 29, 30)
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28-1. The disk drive as recited in claim 27, wherein:
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the first user data is the same as the second user data; the first radial location corresponds to a first read operation during a first revolution of the disk; and the second radial location corresponds to a retry read operation during a second revolution of the disk.
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31. A method of operating a disk drive, the method comprising:
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selecting a first read element and a second read element to detect first user data recorded on a disk when a head is at a first radial location over the disk, wherein a third read element is not used to detect the first user data; and selecting the second read element and the third read element to detect second user data recorded on the disk when the head is at a second radial location over the disk different from the first radial location, wherein the first read element is not used to detect the second user data. - View Dependent Claims (32, 33, 34, 35)
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Specification