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HDD Sector

The sector is the area of the data on a magnetic disk, created by low-level formatting during HDD production. It is a minimal information quantity at record or data reading from the magnetic disk by the magnetic head. The sector structure of different models of hard drives differs and is defined by the type of the controller in use and its firmware, but usually, it consists of the data accessible to the user (usually 512 bytes) and the secondary information available only to a hard drive controller: