Boot viruses

Boot viruses infect the boot sectors of floppy disks and the Boot sectors or Master Boot Sector (MBR) of hard disks.Boot viruses are resident viruses. The infection occurs when the operating system is loaded from the disks.After the computer is turned on, its performance is monitored using a program recorded in a permanent storage device. If the check is successful, the first sector is read from the floppy or hard disk. The order of using disk drives for booting is set by the user using the Setup program.