Appeal No. 1997-2855
Application No. 08/340,546
The Saito patent prevents accidental generation of a
“track zero” signal. According to Saito, a track
zero signal should be generated only when the
magnetic head is driven in the outer peripheral
direction of the floppy disk, and inhibited when the
head is driven in the inner direction.
At the time of the invention, it would have been
obvious to one having ordinary skill in the art to
have applied Saito’s teachings to [appellants’
admitted prior art] AAPA. The combination would
have moved “track zero” to a location near the
transducer ramp.
The motivation for this modification would have
been to more accurately set a relative position
between the magnetic head and the disk, as taught by
Saito. The combination would thereby satisfy the
claim limitations of biasing the data zone toward
the outer periphery of the data storage disk.
Appellants argue (brief, pages 9 and 10) that “Saito is
not directed to a servo writing or disk formatting procedure,
nor does Saito disclose or suggest any method for writing
servo information to a data storage disk,” “Saito presumes the
existence of servo tracks,” and “Saito merely teaches . . .
preventing generation of a spurious track zero signal.” We
agree with appellants’ arguments. The mere fact that “a track
zero signal [in Saito] is generated only when the magnetic
head is driven in the outer peripheral direction of the floppy
disk and reaches a track zero position, and is inhibited from
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