Chapter 5
313
Measurement Definition
Drive Setup/Control
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Simplifying equation 4-18, will give us the general equation in determining skew.
Equation 5-32
Definition of Skew
By substituting the known quantities of PC, PG and radius (r) in equation 4-19 you will be
able to determine the skew angle.
•
r is the radius or perpendicular distance from spindle center to head gap.
•
PG is the distance from pivot to head gap.
•
PC is the distance from pivot to spindle center.
HGA Dimension
To prevent contact with the spindle and other objects. A proper configuration of the HGA
dimension and its reference head position (reference point) has to be established. When the
write track offset is set at zero (0), the reference point will be located at the center of the
track during a write sequence. When the read track offset is set at zero (0), the reference
point will be located at the center of the track during a read sequence. Generally, the
reference point is the same position as the write head point in a slider. Parameters are set by
the “hpe5022_hgaDimension” function.
Figure 5-59
HGA Dimension Parameters
skew
r
2
PG
2
PC
2
Ð
+
(
)
2rPG
(
)
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=
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