Boot sector virus
Computer virus that infects the first or first few sectors of a computer hard drive or diskette drive allowing the virus to activate as the drive or diskette boots.
To help
protect the boot sector from becoming infected with a boot sector virus
many BIOS manufacturers have protection that can be
enabled or disabled through the CMOS
setup. This feature has to be disabled when installing operating system
such as Microsoft Windows that need to write to the boot sector during the
install.
Also see: Boot sector, MBR, Security definitions, Virus