Hardware Reference
In-Depth Information
Figure 5.5: Frequency domain PES in adjacent tracks without error contain-
ment.
Figure 5.6: Frequency domain PES in adjacent tracks with error containment.
This affects the alignment of the transitions written on the new track with
those of the reference track. The new track, which is not aligned with the ref-
erence track, is used as the reference for the next track. So the alignment of the
transitions in the next track with those of the reference track is not expected.
Success of self-servowriting depends on the magnitude of the track-to-track
error as well as on the propagation of error from start to end.
Let P(z) be the model representing PLL dynamics that is biased by a
look up table and C(z)bethePLLloop fi lter. Similar to the case of radial
prorogation, we can de fi ne the noise and disturbance sources for the PLL. Let
v(z) be the time sensing (trigger) noise produced by a combination of head
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