Seek control method to avoid flex cable resonance during settle in hard disk drive
AssigneeSamsung Electronics Co., Ltd.
InventorsChang-Ik Kang, Tao Zhang
Life of this patent
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Abstract
A hard disk drive with a circuit that can perform a seek routine by providing a seek current to a voice coil motor. The voice coil motor is coupled to a head that is coupled to a disk. The seek current provides a predetermined number of harmonics. The number of harmonics is a function of a seek length of the seek routine. By way of example, the seek current may include only a first harmonic for seek lengths less than 20,000 tracks, or only the first and second harmonics for seeks less than 40,000 tracks. The harmonics can be determined by plotting PES settle versus seek length for a hard disk drive.
Claims20
A hard disk drive, comprising:
- a disk;
- a spindle motor that rotates said disk;
- an actuator arm;
- a head coupled to said actuator arm and said disk;
- a voice coil motor that is coupled to said actuator arm;
- and,
- a circuit that can perform a seek routine by providing a seek current to said voice coil motor, said seek current provides a predetermined number of harmonics, the number of said harmonics is a function of a seek length of said seek routine.
A hard disk drive, comprising:
- a disk;
- a spindle motor that rotates said disk;
- an actuator arm;
- a head coupled to said actuator arm and said disk;
- a voice coil motor that is coupled to said actuator arm;
- and,
- seek means for performing a seek routine by providing a seek current to said voice coil motor, said seek current provides a predetermined number of harmonics, the number of harmonics is a function of a seek length of said seek routine.
A method for moving a head relative to a disk of a hard disk drive in a seek routine, comprising:
- providing a seek current to a voice coil motor to move a head relative to a disk, the seek current provides a predetermined number of harmonics, the number of harmonics being a function of a seek length of a seek routine.
A method for selecting one or more seek current frequencies for a seek routine used to move a head relative to a disk of a hard disk drive, comprising:
- plotting a first plot that includes a PES settle versus seek length at different head settling frequencies;
- determining one or more resonant frequencies from the first plot that correspond to flex circuit resonance;
- plotting a second plot that includes a seek current frequency versus a seek length with a plurality of harmonics, the second plot including the one or more resonant frequencies determined from the first plot;
- and,
- selecting one or more seek current frequencies that are a function of seek length and avoids the one or more resonant frequencies that correspond to flex circuit resonance.
Dependencies are inferred from the claim text.