| 摘要 |
A servo test is performed on a disc drive. The servo test includes performing a position error sample (PES) threshold test on tracks in the disc drive and identifying those tracks that fail the PES servo sample test. Zero acceleration path (ZAP) learning is performed on the identified tracks, and is performed on less than all of the tracks on the disc drive. Another PES servo threshold test is performed on the identified tracks to determine whether they pass the servo test, given the ZAP learning process.
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