Servo routine for track seeking in a hard disk drive and hard disk drive for performing the same
AssigneeSeagate Technology LLC
InventorsSung Won Park, Soo Il Choi, Joo-Young Lee
Life of this patent
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Abstract
A method for controlling a hard disk drive, includes a track seeking servo routine in which seek time is measured in a mode of the routine after the trajectory mode, the measured seek time is compared with a predetermined period of time, and an alarm mode is induced when the measured seek time exceeds the predetermined period of seek time.
Claims13
A method for use in a hard disk drive having a track seeking servo routine that includes a trajectory mode utilizing feedforward control;
- an arrive mode and a settle mode utilizing feedback control;
- and an on-track mode during which data is read from or written to a recording disk, the method comprising:
- measuring a seek time during the arrive mode and settle mode;
- comparing the measured seek time with a predetermined period of seek time;
- and
- inducing the hard disk drive to enter an alarm mode when the measured seek time exceeds the predetermined period of seek time.
A method for use in a hard disk drive having a track seeking servo routine that includes a trajectory mode utilizing feedforward control;
- an arrive mode and a settle mode utilizing feedback control;
- and an on-track mode during which data is read from or written to a recording disk, the method comprising:
- applying external shocks to the hard disk drive while applying a command which causes the magnetic head to seek a zero distance
- obtaining an error pattern from position error signals generated as feedback during the applying step;
- storing the error pattern as a table of the position error signals;
- acquiring an error pattern from a position error signal during the arrive and settle modes;
- comparing the stored error pattern with the acquired error patterns;
- and
- inducing the hard disk drive to enter an alarm mode when the comparison yields a predetermined result.
A hard disk drive comprising:
- a disk having servo information recorded thereon;
- and
- a controller including a servo system configured with a track seeking servo routine that includes a trajectory mode utilizing feedforward control;
- an arrive mode and a settle mode utilizing feedback control;
- and an on-track mode during which data is read from or written to the disk,
- wherein the controller is configured to:
- measure a seek time during the arrive mode and settle modes,
- compare the measured seek time with a predetermined period of seek time, and
- induce the servo system to enter an alarm mode when the measured seek time exceeds the predetermined period of seek timed.
A hard disk drive comprising:
- a disk having servo information recorded thereon;
- and
- a controller including a servo system configured with a track seeking servo routine that includes a trajectory mode utilizing feedforward control;
- an arrive mode and a settle mode utilizing feedback control;
- and an on-track mode during which data is read from or written to the disk;
- and
- an electronic data table of position error signals,
- wherein the controller is configured to:
- acquire an error pattern during the arrive and settle modes;
- compare the electronic data table with the acquired error patterns;
- and
- induce the servo system to enter an alarm mode when the comparison yields a predetermined result.
Dependencies are inferred from the claim text.