A bad sector, also known as a “surface defect”, is simply a sector on a computer’s disk drive that is physically damaged and therefore unable to be read. Usually, it is detected by the SCANDISK or CHKDSK utilities software that your operating system is equipped with.
When SCANDISK or CHKDSK find the bad sectors on your drive, they mark them so that the operating system will skip them in the future. This is known as standard disk repair
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