Disk drive having servo sectors that store repeatable runout correction values and related error correction code data
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United States of America Patent
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Apr 11, 2006
Grant Date -
N/A
app pub date -
Feb 28, 2003
filing date -
Feb 28, 2003
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A magnetic disk drive having a reduction in repeatable runout (RRO) effects is disclosed. The disk drive has a head disk assembly (HDA) and a sampled servo controller. The HDA includes a rotating magnetic disk, an actuator, and a transducer head. The magnetic disk has a plurality of embedded servo sectors for storing servo information including repeatable runout (RRO) cancellation values and RRO cancellation value error correction code (ECC) data at a servo data rate. The RRO cancellation value ECC data is only for detecting and correcting errors in the RRO cancellation values. In between the embedded servo sectors are data sectors for storing user data at a user data rate that is different from the servo data rate. The actuator positions the transducer head in response to a control effort signal generated by the sampled servo controller based on the servo information.
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