Boot sector virus

It is developed to destroy or infect the boot sector of the disk where, Master Boot Record (MBR) is stored. MBR is a small program, which is responsible for booting the computer system. This boot sector virus's work is to modify the MBR that prevents anyone from being able to boot or 'start up' the computer from the system disk. By using the infected disk or CD during the booting, such type of viruses transmits automatically in the computer system. The examples of boot sector virus are Danish Boot, Devel 941, Disk Killer, etc.