Method of performing read/write process on recording medium, parameter adjustment method, storage device, computer system, and storage medium employing the methods

A method comprising steps of:

• writing, by a processor of a disc drive, test data to a data region on a recording medium of the disc drive;
• reading, by the processor, the test data from the data region;
• counting, by the processor, a total number of error-corrected error correcting code (“ECC”) symbols in the read of a data sector in the data region;
• determining, by the processor, whether the total number of error-corrected ECC symbols exceeds a first threshold value;
• upon determining that the total number of error-corrected ECC symbols exceeds the first threshold value, determining, by the processor, the data sector to be a defective sector;
• repeating the counting and determining steps for a plurality of data sectors on a track on the recording medium;
• analyzing a distribution of defective data sectors on the track to determine whether an area of the track containing the defective data sectors is greater than a second threshold;
• upon determining that the area of the track is greater than the second threshold, determining whether corresponding defective areas occur in one or more consecutive adjacent tracks of the track;
• and
• upon determining that corresponding defective areas occur in one or more consecutive adjacent tracks of the track, determining the area of the track and the corresponding areas of the one or more consecutive adjacent tracks including the defective data sectors to be a massive defective area.

A storage device comprising:

• a recording medium comprising a plurality of tracks, each of the plurality of tracks comprising a plurality of data 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, the plurality of data sectors of a target track of the recording medium;
• and
• a memory containing code objects configured to cause the processor to
• write test data to the plurality of data sectors of the target track,
• read the test data from the plurality of data sectors of the target track,
• count a total number of error-corrected error correcting code (“ECC”) symbols in the read of each of the plurality of data sectors,
• determine whether the total number of error-corrected ECC symbols of a data sector exceeds a first threshold value,
• upon determining that the total number of error-corrected ECC symbols exceeds the first threshold value, determining the data sector to be a defective sector,
• analyze a distribution of defective data sectors on the target track to determine whether an area of the track containing the defective data sectors is greater than a second threshold,
• upon determining that the area of the target track is greater than the second threshold, determine whether corresponding defective areas occur in one or more consecutive adjacent tracks of the target track, and
• upon determining that corresponding defective areas occur in one or more consecutive adjacent tracks of the target track, determine the area of the target track and the corresponding areas of the one or more consecutive adjacent tracks including the defective data sectors to be a massive defective area.