Disc locked clock-based servo timing
AssigneeSeagate Technology LLC
InventorsJason Bellorado, Marcus Marrow
Life of this patent
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Abstract
Systems and methods are disclosed for timing servo operations within a channel based on a counter for a disc locked clock. In certain embodiments, an apparatus may comprise a servo channel configured to lock a frequency of a servo channel clock to a rotational velocity of a disc data storage medium, and maintain a counter of clock cycles for the servo channel clock. The servo channel may perform operations to read servo data from a servo sector on the disc data storage medium at a first counter value selected relative to a target counter value corresponding to an expected location of a servo timing mark (STM).
Claims30
An apparatus comprising:
- a servo channel configured to:
- lock a frequency of a servo channel clock to a rotational velocity of a disc data storage medium;
- maintain a counter of clock cycles for the servo channel clock;
- and
- perform operations to read servo data from a servo sector on the disc data storage medium at a first counter value selected relative to a target counter value corresponding to an expected location of a servo timing mark (STM).
A method comprising:
- locking, at a servo channel, a frequency of a servo channel clock to a rotational velocity of a disc data storage medium;
- maintaining a counter at the servo channel of clock cycles for the servo channel clock;
- and
- performing, at the servo channel, operations to read servo data from a servo sector on the disc data storage medium at a first counter value selected relative to a target counter value corresponding to an expected location of a servo timing mark (STM).
An apparatus comprising:
- a data storage device including:
- a disc data storage medium;
- a channel circuit configured to:
- lock a frequency of a channel clock to a rotational velocity of the disc data storage medium;
- maintain a counter of clock cycles for the channel clock;
- and
- perform operations to read servo data from a servo sector on the disc data storage medium at a first counter value selected relative to a target counter value corresponding to an expected location of a servo timing mark (STM).
Dependencies are inferred from the claim text.