| 摘要 |
A technique tracks head asymmetry of a magnetic recording device over time. In particular, a reference pattern having a known fundamental/reference frequency may be read from a reserved track of a magnetic recording medium to produce a response signal, and signal power may then be determined at the reference frequency and at a second harmonic component frequency of the reference frequency. Accordingly, head asymmetry for the device may be tracked based on a ratio of the signal power at the second harmonic component frequency to the signal power at the reference frequency.
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