Appeal No. 1999-0170
Application No. 08/588,020
plural tracks having data recorded thereon are concentrically
or spirally formed on a recording surface of the disk.
Address information specifying the tracks is recorded on the
corresponding tracks by changing a direction of magnetization
in a circumferential direction of the disk. In a terminal
region of the address information, terminal information is
also formed by magnetization in a predetermined direction.
Claim 1 is illustrative of the invention and reads as
follows:
1. A magnetic disk having plural tracks for
recording data concentrically or spirally formed on a
recording surface thereof,
wherein address information for specifying the
tracks is recorded on the corresponding tracks as a
direction of magnetization in a circumferential direction
of the disk, so that a first polarity in a first
circumferential direction of the disk represents a one,
and an opposite polarity in an opposite circumferential
direction of the disk represents a zero, of the address
information corresponding to a Grey code between
neighboring tracks, and wherein terminal information
magnetized in a predetermined direction is recorded in a
terminal region of the address information.
The Examiner relies on the following prior art:
Duffy et al. (Duffy) 5,262,907 Nov. 16,
1993
Fisher 5,384,671 Jan. 24,
1995
(filed Dec. 23, 1993)
2
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