Method and apparatus for determining equalized signal-to-noise ratio in a storage device
AssigneeSeagate Technology LLC
InventorsEdmun ChianSong Seng, UttHeng Kan, AikChuan Lim, KayHee Tang
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Abstract
A method and data storage device determine an equalized signal-to-noise ratio in the storage device. The equalized signal-to-noise ratio is determined by generating an analog read signal, passing the read signal through an equalizer in the storage device, and sampling the equalized signal using an analog-to-digital converter in the storage device. The samples from the analog-to-digital converter are then used in the equalized signal-to-noise calculation.
Claims18
A method of determining an equalized signal-to-noise ratio in a storage device, the method comprising steps of:
- (a) generating an analog read signal;
- (b) passing the analog signal through an equalizer in the storage device to produce an equalized signal;
- (c) sampling the equalized signal using an analog to digital converter in the storage device to produce equalized samples;
- and
- (d) calculating the equalized signal-to-noise ratio based on the equalized samples.
A data storage device for reading data from a medium, the data storage device comprising:
- a head for generating an analog signal based on data stored on a medium;
- an equalizer that equalizes the analog signal to form an equalized signal;
- an analog-to-digital converter that samples the equalized signal to generate plurality of samples;
- a selector that selects a sample from the plurality of samples and provides the selected sample to a data buffer;
- and
- an equalized signal-to-noise ratio calculator that calculates an equalized signal-to-noise ratio based on the samples in the data buffer.
A data storage device for retrieving data from a recording medium, the data storage device comprising:
- a read head and read channel for generating equalized data samples from data stored on the recording medium;
- and
- equalized signal-to-noise ratio calculating means coupled to the read channel for determining an equalized signal-to-noise ratio from the equalized data samples.
Dependencies are inferred from the claim text.