Appeal No. 1998-3348 Page 3
Application No. 08/541,948
coupling of the pitching mode mechanical resonance frequency
of the no-load spindle motor and the primary mechanical
resonance frequency of a plurality of disks to be loaded. By
selecting the spindle motor and disk to minimize the
difference between the first mechanical resonance frequency
value and the second mechanical resonance frequency value, the
actual resonance frequency value of the HDD will be
approximately the same for one disk as for multiple disks.
Manufacturing efficiency is promoted because a single type of
enclosure case is compatible with an HDD no matter whether one
or multiple disks are included therein.
Claim 9, which is representative for our purposes,
follows:
9. A method for preventing instability of
track following of a magnetic head using one and the
same enclosure case in a product lineup, independent
of the number of disks, comprising the steps of:
determining a first mechanical resonance
frequency associated with the coupling of the
pitching mode mechanical resonance frequency of a
no-load spindle motor and the primary mechanical
resonance frequency of one disk to be loaded;
determining a second mechanical resonance
frequency associated with the coupling of the
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