Primary and secondary servo timing gates used with simultaneously operating readers
AssigneeSeagate Technology LLC
InventorsPuskal Prasad Pokharel, Gary E. Hillukka, Timothy F. Ellis
Life of this patent
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Abstract
First and second read channel logic circuits are configured to process first and second signals communicated from respective first and second readers that simultaneously read from a magnetic disk. A first servo detection circuit generates a primary servo gate based on timing data from the first reader. The primary servo gate is used for processing the first signal via the first read channel logic. A second servo detection circuit that generates a secondary servo gate based on the primary servo gate and an adjustment value. The secondary servo gate is used for processing the second signal via the second read channel logic.
Claims20
An apparatus, comprising:
- first and second read channel logic circuits configured to process first and second signals communicated from respective first and second readers, the first and second readers simultaneously reading from a magnetic disk;
- a first servo detection circuit that generates a primary servo gate based on timing data read from the magnetic disk via the first reader, the primary servo gate used for processing the first signal via the first read channel logic;
- and
- a second servo detection circuit that generates a secondary servo gate based on the primary servo gate and an adjustment value, the secondary servo gate used for processing the second signal via the second read channel logic.
A method comprising:
- generating a primary servo gate based on a first timing data read from a magnetic disk via a first reader, the first reader associated with a first read channel logic circuit;
- processing a first signal of the first reader via a first read channel logic circuit that utilizes the primary servo gate for timing;
- generating a secondary servo gate based on the primary servo gate and an adjustment value;
- and
- processing a second signal of a second reader via a second read channel logic circuit that utilizes the secondary servo gate for timing, the first and second readers simultaneously reading from the same magnetic disk.
An apparatus, comprising:
- interface circuitry configured to receive first and second signals generated by respective first and second readers that read simultaneously from a magnetic disk;
- a controller configured to:
- generate a primary servo gate based on first timing data detected from the first signal;
- process the first signal via a first read channel logic circuit that utilizes the primary servo gate for timing;
- generate a secondary servo gate based on the primary servo gate and an adjustment value;
- and
- process the second signal of the second reader via a second read channel logic circuit that utilizes the secondary servo gate for timing.
Dependencies are inferred from the claim text.