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The servo disk surface is shown in Figure 1-3.
Figure 1-3 D2246 Servo Disk Surface
The Index signal is a six-bit pattern written along one radius of the servo surface. It
identifies the beginning of a recording track. The index pattern repeats each time the
radius intersects one of the recording tracks.
The servo data zone contains 692 concentric recording tracks. Each recording track
contains prerecorded positioning data, including clock and synchronization signals, that
provide information to place and maintain the read/write heads on track.
The inner and outer guard bands bracket the servo data zone. They contain recurring
six-bit patterns to distinguish them from the servo data zone.
The landing zone is a silicon-coated surface where the read/write heads rest when the
recording disks are not spinning. During read, write, and seek operations the heads
"float" approximately 20 microinches above the surface of the disk.
1-3
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