Sector - Data Recovery Glossary

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Data Recovery Glossary > Sector

A hard disk is divided into various sections to conveniently store data. The smallest unit of storage on a hard disk is called Sector. The size of a sector varies from one disk to another, this size is determined at the time of formatting. One sector of a disk stores one user record of data which is usually 512 bytes. An inaccessible sector of the disk is called bad sector.

A group of 64 sectors is called a cluster. The data stored on the hard disk is accessible and identified by the track and sector number, thus sector is the smallest and most essential section of a hard disk. Number of sectors per track is determined by the system type, the controller capabilities and drive encoding method.

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