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Volume Boot Sectors
Each partition (also sometimes called a "logical DOS volume" in the DOS/Windows world) has its own volume boot sector. This is distinct from the master boot sector (or record) that controls the entire disk, but is similar in concept. It is also sometimes called the volume boot record or partition boot sector. Each volume boot sector contains the following:
The volume boot sector is created when you do a high-level format of a hard disk partition. The boot sector's code is executed directly when the disk is booted, making it a favorite target for virus writers. The information contained in the disk parameter block is used by the operating system to determine where other internal structures of the partition are located, such as the file allocation tables.