Patent ID: 11935571
Assignee: MARVELL ASIA PTE LTD
Field: Audio-visual technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 8:
9. A data storage system comprising:
a storage device; and
a storage controller separate from the storage device; wherein:
the storage device comprises:
a storage medium, having multiple storage medium surfaces on which servo data is written, the servo data on each storage medium surface including a repeatable run-out field representing a recurring contribution to position error; and
circuitry for writing the repeatable run-out field, the circuitry comprising:
a first read channel,
a second read channel,
a first detector on a first read head of the storage device, the first detector being configured to detect data, including a servo sync mark, on a first track on a first storage medium surface of the storage device, and
a second detector on a second read head of the storage device, the second detector being configured to detect data on a second track on a second storage medium surface of the storage device; and

the system is configured to:
process servo signals from the first track, to generate first positioning signals for positioning the first read head relative to the first track for writing first repeatable run-out data,
process servo signals from the second track, to generate second positioning signals for positioning the second read head relative to the second track for writing second repeatable run-out data, and
write the first repeatable run-out data to servo wedges of the first track according to the first positioning signals, and the second repeatable run-out signals to servo wedges of the second track according to the second positioning signals, using a single write data channel of the storage device.