Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. A bad sector is a sector on a computer's disk drive or flash memory that cannot be used due to permanent damage (or an OS inability to successfully access it), such as physical damage to the disk surface or failed flash memory transistors. It is usually detected by a disk utility software such as CHKDSK or SCANDISK on Microsoft systems, or badblocks on Unix-like systems. When found, these programs may mark the sectors unusable (all file systems contain provision for bad-sector marks) and the operating system skips them in the future.

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