Detecting a servo address mark (SAM) in a servo field sync-up operation
AssigneeWestern Digital Technologies, Inc.
InventorMasao Miyamura
Life of this patent
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Abstract
A method for detecting a servo address mark (SAM) of a servo sector of a disk of a disk drive during a servo field sync-up operation is disclosed. The method includes: detecting a start of a preamble; opening a SAM search window to detect the SAM; and continuing to detect the presence of the preamble during a SAM search time period. Further, the method discloses that: if the preamble is detected, the SAM search window is continued; and if the preamble is not detected, and the SAM is not detected, the SAM search window is closed.
Claims26
A method for detecting a servo address mark (SAM) of a servo sector of a disk during a servo field sync-up operation, the method comprising:
- detecting a start of a preamble;
- opening a SAM search window to detect the SAM;
- and
- continuing to detect the presence of the preamble during a SAM search time period, wherein:
- if the preamble is detected, continuing the SAM search window;
- and
- if the preamble is not detected, and the SAM is not detected, closing the SAM search window.
A disk drive comprising:
- a head to read servo sectors;
- a disk having a plurality of tracks, a substantial majority of the tracks having a plurality of servo sectors;
- and
- a read/write channel coupled to the head to implement operations to detect a servo address mark (SAM) of a servo sector of the disk during a servo field sync-up operation, the operation comprising:
- detecting a start of a preamble;
- opening a SAM search window to detect the SAM;
- continuing to detect the presence of the preamble during a SAM search time period, wherein:
- if the preamble is detected, continuing the SAM search window;
- and
- if the preamble is not detected, and the SAM is not detected, closing the SAM search window.
A disk drive comprising:
- a disk having a plurality of tracks, a substantial majority of the tracks having a plurality of servo sectors;
- means for detecting a start of a preamble of a servo sector of the disk;
- means for opening a SAM search window to detect the SAM;
- and
- means for continuing to detect the presence of the preamble during a SAM search time period, wherein:
- if the preamble is detected, continuing the SAM search window;
- and
- if the preamble is not detected, and the SAM is not detected, closing the SAM search window.
Dependencies are inferred from the claim text.