Appeal No. 1998-3348 Page 2
Application No. 08/541,948
respect to HDDs, the industry attempts to use the same disk
drive enclosure case for an HDD having a single disk and
also for an HDD having multiple disks.
Heretofore, the difference in mechanical resonance
frequencies of a single-disk HDD and a multiple-disk HDD has
impeded the use of a standard enclosure case for both single-
disk and multiple-disk HDDs. Because the enclosure case
affects the mechanical resonance frequency of an HDD, the
enclosure case has only been compatible with one of the two
HDDs. Without compatibility between the enclosure case and
the HDD, magnetic head stability during track following could
not be maintained.
In contrast, the appellants’ invention uses an artificial
movement model to derive first and second mechanical resonance
frequency values. The first mechanical resonance frequency is
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. The
second mechanical resonance frequency is associated with the
Page: Previous 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Next
Last modified: November 3, 2007