Chapter 5
269
Measurement Definition
Measurement Parameter Definition
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1. When an adjacent track is far, only noise from the media and the written old data limit
the off-track capability. So the affordable off-track is relatively constant as shown above.
Figure 5-23
The adjacent track is written next to the data track.
2. When the adjacent track is written next to the data track, the erase bands of both tracks
form an erased strip on the media. This erase strip decreases the interference signal of the
adjacent track, and as a result it increases the OTC required to reach a specified level as
shown in Figure 5-23.
Figure 5-24
The data track is overwritten by the adjacent track.
3. When the adjacent track is written close enough to overwrite the data track. The read
head starts to pick up the interference signal from this adjacent track, thus decreasing the
affordable off-track as shown in Figure 5-24. The process by which the adjacent track is
brought closer to the data track for step-by-step measurement of the OTC is called squeeze.
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