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Standard Triple Track Test
The Standard Tripe Track Test is used to measure the write width, read width, write-read
offset, squash, squeeze and off-track read capability (OTRC) parameters of the written
signal. This test performs the track profile as it measures the effect on how adjacent tracks
and erased signals interfere with one another. Standard test parameters such as Resolution,
PW50, Roll-off, etc. do not predict the off-track capability of the head. Although BERs'
747 test and Bathtub tests are considered the best method in evaluating the off-track
performance of the head, it requires the use of read channel IC, a more complex and
expensive hardware. The triple track test is a good alternative solution in determining the
off-track performance of the head.
Measurement procedure of the Triple Track Test is as follows:
1. Perform band erase to eliminate noise from the media.
2. Write the data at the track center.
3. Measure the track profile of the TAA from the written test track.
4. Specify the interpolation range which includes the threshold and window size settings.
Refer to Figure 3-73, "Best Fit Window," on page 129 for details.
5. Measure the distance between the interpolation lines at 50% threshold and denote the
measured distance as the write track width.
6. Measure the distance between the interpolation lines at 0% threshold (i.e., floor level).
Subtract the write track width from this result and denote the new width as the read
track width.
Figure 5-45
Measurement of Write Track Width and Read Track Width
Chapter 5
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Measurement Definition
Parametric Sweep Measurement Definitions
293
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