Appeal No. 1998-2499
Application No. 08/632,639
a disk file. The read element has a width less than the write
element and the read element width is less than half of the
width of a data cylinder.
Representative independent claim 1 is reproduced as
follows:
1. Apparatus for servo positioning in a
disk file comprising:
at least one disk mounted for rotation
about an axis and having at least one disk
surface for storing data;
transducer means mounted for movement
across said disk surface for writing to and for
reading data and servo patterns from said disk
surface; said transducer means including a read
element and a write element, said read element
having a width less than said write element and
said and element being greater than 1/3 of the
width of a data cylinder and less than 1/2 the
width of the data cylinder; and
a servo pattern written on said data disk
surface having a non-zero track pitch of less
than 1/2 of the width of a data cylinder and
said servo pattern repeating in a selected
number of data cylinders; said selected number
being a value equal to a positive power of two.
The examiner relies on the following references:
Axmear et al. (Axmear) 4,549,232 Oct. 22,
1985
Moon et al. (Moon) 4,669,004 May 26,
1987
2
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