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US 9,978,420 B2Granted
Method of performing read/write process on recording medium, parameter adjustment method, storage device, computer system, and storage medium employing the methods
AssigneeSeagate Technology LLC
InventorWalter Jun
Life of this patent
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Abstract
Methods, apparatuses and systems for detecting defective sectors on a recording medium, the method including calculating a servo gain for each servo sector of a track of a recording medium of a storage device; determining whether the servo gain of each servo sector exceeds a threshold value; and upon determining that the servo gain of a servo sector exceeds the threshold value, determining data sectors included in the servo sector to be defective sectors.
Claims18
A defective sector detector of a storage device comprising:
- a first servo gain calculator configured to calculate a servo gain for a servo sector on a track of a recording medium of the storage device;
- a buffer configured to store servo gains for each servo sector of the track;
- a second servo gain calculator configured to calculate a servo gain of the track by calculating an average of the servo gains for the servo sectors on the track from the buffer;
- a threshold value calculator configured to calculate a threshold value by multiplying the servo gain of the track by a proportional constant;
- and
- a defective sector determination unit configured to:
- receive the servo gain for the servo sector from the first servo gain calculator,
- determine whether the servo gain exceeds the threshold value, and
- upon determining that the servo gain exceeds the threshold value, output information indicating a plurality of data sectors included in the servo sector to be defective sectors.
6 more elements
A method comprising steps of:
- calculating a servo gain for each servo sector of a track of a recording medium of a storage device;
- calculating an average servo gain for the track by averaging the servo gains for each servo sector of the track;
- calculating a threshold value by multiplying the average servo gain of the track by a proportional constant greater than 0 and less than 1;
- determining whether the servo gain of each servo sector exceeds the threshold value;
- and
- upon determining that the servo gain of a servo sector exceeds the threshold value, determining data sectors included in the servo sector to be defective sectors.
3 more elements
A storage device comprising:
- a recording medium comprising a plurality of tracks, each of the plurality of tracks comprising one or more servo sectors;
- a media interface which writes information to, or reads information from, the recording medium by accessing the recording medium;
- a processor which controls the media interface to write data to, or read data from, a target track of the recording medium;
- and
- a memory containing code objects configured to cause the processor to
- calculate a servo gain for each servo sector of the target track,
- calculate an average servo gain for the target track by averaging the servo gains for each servo sector of the target track,
- calculate a threshold value by multiplying the average servo gain of the target track by a proportional constant greater than 0 and less than 1,
- determine whether the servo gain of each servo sector exceeds the threshold value, and
- upon determining that the servo gain of a servo sector exceeds the threshold value, determine data sectors included in the servo sector to be defective sectors.
7 more elements
Dependencies are inferred from the claim text.