Disk drive having a channel circuit which receives a read signal representing data in a data sector and data in a servo sector in a first order and demodulates the read signal to provide data sector data and servo-sector data in a second order
AssigneeWestern Digital Technologies, Inc.
InventorsRichard W. Hull, Hoover K. Jung, Sanjay S. Mathur
Life of this patent
Estimating the term…
Abstract
A disk drive has a channel circuit for demodulating data sectors and servo sectors stored on a rotating medium to provide data-sector data and servo-sector data. The channel circuit transmits the data-sector data and servo-sector data to a disk controller circuit in an order which is different than the order in which they are stored on a rotating medium to allow for demodulation latency while maintaining real-time updates of embedded servo information.
Claims20
A disk drive comprising:
- a disk comprising a track having a data sector and a servo sector arranged in a first order;
- a read head for providing a read signal representing data stored in the data sector and data stored in the servo sector in the first order;
- a channel circuit;
- a disk controller circuit;
- the channel circuit comprising:
- means for demodulating the read signal to generate data-sector data and servo-sector data;
- and
- means for providing the data-sector data and the servo-sector data to the disk controller circuit in a second order;
- wherein the second order is different from the first order.
A disk drive comprising:
- a disk comprising a track having a data sector and a servo sector arranged in a first order;
- a read head for providing a read signal representing data stored in the data sector and data stored in the servo sector in the first order;
- a channel circuit;
- a disk controller circuit;
- the channel circuit comprising:
- means for demodulating the read signal to generate data-sector data and servo-sector data;
- and
- means for providing the data-sector data and the servo-sector data to the disk controller circuit in a second order, the providing means including a FIFO buffer;
- wherein the second order is different from the first order.
A disk drive comprising:
- a disk comprising a track having a data sector and a servo sector arranged in a first order;
- a read head for providing a read signal representing data stored in the data sector and data stored in the servo sector in the first order;
- a channel circuit;
- a disk controller circuit;
- the channel circuit comprising:
- means for demodulating the read signal to generate data-sector data and servo-sector data;
- and
- means for providing the data-sector data and the servo-sector data to the disk controller circuit in a second order, the providing means including a dual-ported RAM;
- wherein the second order is different from the first order.
A disk drive comprising:
- a disk comprising a track having a data sector and a servo sector arranged in a first order;
- a read head for providing a read signal representing data stored in the data sector and data stored in the servo sector in the first order;
- a channel circuit;
- a disk controller circuit;
- the channel circuit comprising:
- first means for demodulating the read signal to output data-sector data;
- second means for demodulating the read signal to output servo-sector data, and
- means for multiplexing the output of the first and second means to provide the data-sector data and the servo-sector data to the disk controller circuit in a second order;
- wherein the second order is different from the first order.
A method of operating a disk drive, the disk drive including a rotating disk comprising a track having a data sector and a servo sector arranged in a first order, a channel circuit and a disk controller circuit, the method comprising the steps of:
- reading from the rotating disk to provide a read signal representing data stored in the data sector and data stored in the servo sector in the first order;
- demodulating the read signal to generate data-sector data and servo-sector data;
- and
- providing the data-sector data and the servo-sector data to the disk controller circuit in a second order that is different from the first order.
Dependencies are inferred from the claim text.