Appeal No. 96-3901
Application 08/192,638
connected to the disc 16. Rather, it is an independent
reference level which is sent to offset measuring system 28
via line 40. Appellant further points to Figure 4 which does
not show the reference voltage 20 connected to the recording
head 43, but rather, the reference voltage 20 is connected to
a comparator 42 via line 40.
Upon a careful review of the references, we find
that
none of the references teaches or suggests determining a
radial read-to-write offset between the read and write
elements at a track on a disc surface of a disc drive system
by incrementally moving the element across a width of the
track to measure a maximum amplitude in the read signal and
incrementally moving the read element across the width of the
track to find first and second actuator offsets where the read
signal has an amplitude approximately equal to a predetermined
percentage of the maximum amplitude as recited in each of the
independent claims 1, 6, 10 and 15. We find that Bremmer
teaches in column 2, lines 25-40, that the reference voltage
20 is a predetermined voltage which is typically within the
7
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