Method and apparatus improving prevention of off-track writing in a hard disk drive
AssigneeSamsung Electronics Co., Ltd.
InventorsChang-Ik Kang, Bong-Jin Lee
Life of this patent
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Abstract
Embodiments of the invention include: a hard disk drive using a read track to position for writing to a write track and generating a position error signal (PES) based upon all four servo offset bursts used to disable writing when the PES exceeds a position error threshold; a preamplifier generating the PES from four bursts from a slider reading the read track to position when the write track is to be written, and methods of writing the write track using PES from four bursts of the read track that disables writing when the PES is above the position error threshold.
Claims14
A hard disk drive, comprising:
- a disk with a write track and a read track;
- a slider accessing said disk to write said write track and read said read track to sense four servo offset bursts as a read channel for positioning information, said four servo offset bursts consisting of an A burst, a B burst, a C burst, and a D burst;
- a preamplifier receiving said read channel for creating a position error signal using all of said four servo offset bursts;
- and
- an embedded circuit receiving said position error signal to stop writing said write track when said position error signal exceeds a position error threshold.
A preamplifier for communicating with a slider comprising a means for generating a position error signal based upon four servo offset bursts sensed by said slider when said slider is to write a write track.
A method of operating a hard disk drive, comprising the steps of:
- creating a position error signal using all of four servo offset bursts read from a read track when said write track is to be written, wherein said four servo offset bursts consist of an A burst, a B burst, a C burst, and a D burst;
- and
- using said position error signal to disable said writing of said write track when said position error signal exceeds a position error threshold.
Dependencies are inferred from the claim text.