Method and apparatus for determining read-head deviation using orthogonal preambles

摘要

A storage device includes read circuitry having a read head having a detector that outputs signals representing data from a first track and an adjacent track. The read head is subject to off-track excursions during which the read head detects signals from both the first track and an adjacent track. Data on each track includes a preamble including a repeating pattern. The repeating pattern in any first track is orthogonal to the repeating pattern in any track adjacent to the first track. The read circuitry also includes respective Discrete Fourier Transform circuits to identify components in the signals corresponding to respective frequencies characteristic of the repeating pattern on the first track and the repeating pattern on the second track, and computation circuitry to determine from the components a ratio by which the read head is off-track. Corresponding methods are provided for operating such a storage device and for reading data.

主权项

1. A method of operating a storage device having a storage medium, the method comprising:
writing data to tracks on the storage medium, data for each track including a preamble including a repeating pattern, wherein the repeating pattern on any first track is orthogonal to the repeating pattern on any track adjacent to the first track; detecting with a read head signals from both the first track and an adjacent track; analyzing preamble output of the read head, derived from preambles of user data outside servo wedges of the storage medium, to determine a ratio by which the read head is off-track.