Hardware support of servo format with two preamble fields

摘要

A hard disk drive uses a second, reference burst field in a preamble to estimate burst phase and burst magnitude. Such estimations are used for position error signal integration and repeatable runout correction. Gain error is also derived from such estimations. Information contained in a preamble field is used in conjunction with the reference burst phase estimation to synchronize servo address marks.

主权项

1. A hard disk drive comprising:
a processor; memory connected to the processor; a storage element connected to the processor; and computer executable program code configured to execute on the processor, wherein the computer executable program code is configured to:
receive a data stream from the storage element, the data stream comprising:
a preamble comprising at least a first field and a second field, the second field comprising a reference burst, the preamble having a resolution for maintaining a first pattern at a first rate, the reference burst having a resolution for maintaining a second pattern at a second rate; anda position error signal burst wherein the position error signal burst and the reference burst comprise a common frequency;calculate a burst phase estimation based on the reference burst; andcalculate a burst magnitude estimation based on the reference burst.