US 11,087,788 B1 · Unified time base for self-servo-write operation

Abstract

Storage device self-servo-write includes generating a time base frequency signal, generating a sampled frequency signal by sampling the time base frequency signal at a sample rate to obtain a first set of samples, decimating those samples at a decimation rate to obtain a second set of samples at a spiral frequency of which the time base frequency is a first integer multiple, detecting a spiral track based on the spiral frequency, and writing a servo pattern based on the spiral track and the time base frequency. A generated sampled frequency obtained by sampling the time base frequency signal at the sample rate is used as the servo write frequency, of which the time base frequency is a second integer multiple. Alternatively, the time base frequency is multiplied by a first rational multiple so that the time base frequency is a second rational multiple of the servo write frequency.

Claims20

Dependent claims

A self-servo-write method in a storage device, the method comprising:

generating a time base frequency signal;
generating a sampled frequency signal by sampling the time base frequency signal at a sample rate to obtain a first set of samples of the time base frequency signal;
decimating the first set of samples of the time base frequency signal at a decimation rate to obtain a second set of samples at a spiral frequency that is lower than the time base frequency, the time base frequency being a first integer multiple of the spiral frequency;
detecting a spiral track based on the spiral frequency that was obtained by decimating the first set of samples of the time base frequency signal;
and
writing a servo pattern based on the detected spiral track and the time base frequency.

3 more elements

A storage device, comprising:

a storage medium on which servo data is written using a self-servo-write operation;
and
circuitry for performing the self-servo-write operation, the circuitry comprising:
a time base frequency signal generator;
sampling circuitry configured to generate a sampled frequency by sampling output of the time base frequency signal generator at a sample rate to obtain a first set of samples of a time base frequency signal;
a first filter configured to decimate the first set of samples of the time base frequency signal at a decimation rate to obtain a second set of samples at a spiral frequency that is lower than the time base frequency, the time base frequency being a first integer multiple of the spiral frequency;
spiral detector circuitry configured to detect a spiral track based on the spiral frequency that was obtained by decimating the first set of samples of the time base frequency signal;
and
a write pattern generator configured to write a servo pattern based on the detected spiral track and the time base frequency.

6 more elements

Dependencies are inferred from the claim text.

Unified time base for self-servo-write operation

Life of this patent

Unified time base for self-servo-write operation

Life of this patent

Abstract

Claims20