| 摘要 |
<p>A magnetic disk (10) includes a pair of azimuth test tracks (30, 32) of relatively narrow trackwise width located adjacent each other so that a magnetic head (28), the azimuth of which is to be measured, straddles both tracks at the same time. Each test track includes a recording pattern comprising a series of separate, uniformly spaced magnetic domains (34) of alternating orientation, the recording pattern on one track being in a particular phase relative to the recording pattern on the other track. Upon playback, the magnetic head produces a composite playback signal comprising a series of localized peaks, the time between adjacent peaks being functionally related to head azimuth.</p> |
