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23/09/2020

TECH KNWOLODGY

WHAT IS BAD SECTOR IN HARD DISK

Bad sector in computing refers to a disk sector on a disk storage unit that is permanently damaged. Upon taking damage, all information stored on that sector is lost. When a bad sector is found and marked, the operating system skips it in the future

A bad sector is the result of mechanical damage. Bad sectors are a threat to information security in the sense of data remanence. Very often physical damages can interfere with parts of many different files.

Operating system

Bad sectors may be detected by the operating system or the disk controller. Most file systems contain provisions for sectors to be marked as bad, so that the operating system avoids them in the future. Disk diagnostic utilities, such as CHKDSK (Microsoft Windows), Disk Utility (on macOS), or badblocks (on Linux) can actively look for bad sectors upon user request.

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