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US 8,786,978 B2Granted
Magnetic disk device and method of controlling head position
AssigneeKabushiki Kaisha Toshiba
InventorShinsuke Akiya
Life of this patent
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Abstract
According to one embodiment, a magnetic disk device includes a reference head select module selects any one of magnetic heads as a reference head; a follow-up controller executes a follow-up control of a trajectory of the reference head based on a signal read by the reference head; and an eccentric controller executes an eccentric control of a trajectory of a magnetic head other than the reference head in order that an eccentric error between the trajectory of the reference head and the trajectory of the corresponding magnetic head is close to zero.
Claims10
A magnetic disk device comprising:
- at least one magnetic disk;
- a plurality of magnetic heads for a disk surface of each magnetic disk;
- a reference head select module configured to select any one of the magnetic heads as a reference head;
- a follow-up controller configured to execute a follow-up control of a trajectory of the reference head based on a signal read by the reference head;
- and
- an eccentric control unit configured to execute an eccentric control of a trajectory of a magnetic head other than the reference head, causing an eccentric error between the trajectory of the reference head and the trajectory of the corresponding magnetic head to be effectively zero,
- wherein a read post code for the reference head is deleted so as to decrease a length of a servo gate for the reference head by a length corresponding to the deleted read post code.
4 more elements
A magnetic disk device comprising:
- at least one magnetic disk;
- a plurality of magnetic heads for a disk surface of each magnetic disk;
- a reference head select module configured to select any one of the magnetic heads as a reference head;
- a self-servo write controller configured to write a servo pattern on the respective disk surfaces using the respective magnetic heads;
- a first follow-up controller configured to execute a follow-up control of a trajectory of the reference head based on a signal read by the reference head;
- and
- a second follow-up controller configured to execute, for the magnetic head other than the reference head, a follow-up control of a trajectory of the magnetic head that is on a bank same as the bank of the reference head,
- wherein a read post code for the reference head and the magnetic heads other than the reference head is deleted so as to decrease a length of a servo gate for the reference head and the magnetic heads other than the reference head by a length corresponding to the deleted read post code.
5 more elements
A method of controlling a head position comprising:
- selecting any one of magnetic heads provided for a disk surface of each magnetic disk as a reference head;
- executing a follow-up control of a trajectory of the reference head based upon a signal read by the reference head;
- and
- executing an eccentric control of a trajectory of a magnetic head other than the reference head, causing an eccentric error between the trajectory of the reference head and the trajectory of the corresponding magnetic head to be effectively zero,
- wherein a read post code for the reference head is deleted so as to decrease a length of a servo gate for the reference head by a length corresponding to the deleted read post code.
2 more elements
A method of controlling a head position comprising:
- selecting any one of magnetic heads provided for a disk surface of each magnetic disk as a reference head;
- writing simultaneously a servo pattern for the magnetic heads on the disk surface by each of the magnetic heads;
- executing a follow-up control of a trajectory of the reference head based upon a signal read by the reference head;
- and
- executing, for the magnetic head other than the reference head, a follow-up control of a trajectory of the magnetic head that is on a bank same as the bank of the reference head,
- wherein a read post code for the reference head and the magnetic heads other than the reference head is deleted so as to decrease a length of a servo gate for the reference head and the magnetic heads other than the reference head by a length corresponding to the deleted read post code.
3 more elements
Dependencies are inferred from the claim text.