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US 7,609,469 B2Granted
Alternative sensors for tracking and timing in bit patterned media
AssigneeSeagate Technology LLC
InventorsEdward Charles Gage, Venkata Sailaja Chilaka, Chubing Peng, Mark Edward Re
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Abstract
An apparatus includes a bit patterned magnetic storage media, a write transducer positioned adjacent to the bit patterned magnetic storage media, a write driver coupled to the write transducer to deliver write pulses to the write transducer, an optical sensor for producing a bit pattern signal, and a timing recovery circuit for producing a synchronization signal in response to the bit pattern signal, wherein the timing of the write pulses is adjusted in response to the synchronization signal.
Claims19
An apparatus comprising:
- a bit patterned magnetic storage media;
- a write transducer positioned adjacent to the bit patterned magnetic storage media;
- a write driver coupled to the write transducer to deliver write pulses to the write transducer;
- an optical sensor for producing a bit pattern signal;
- and
- a timing recovery circuit for producing a synchronization signal in response to the bit pattern signal, wherein the timing of the write pulses is adjusted in response to the synchronization signal.
3 more elements
A method comprising:
- using an optical sensor to produce a bit pattern signal representative of locations of bit islands in a bit patterned magnetic storage media;
- and
- using the bit pattern signal to control the timing of write pulses applied to a write transducer to control a direction of magnetization of the bit islands.
A method comprising:
- directing a spot of light onto a surface of a bit patterned data storage media;
- and
- producing an error signal in response to light reflected from an island on the bit patterned data storage media, wherein the error signal is representative of a position of the spot with respect to the island.
Dependencies are inferred from the claim text.