The glossary below contains many of the terms you will find in common use throughout the Symantec Security Response website. Please refer to this list to find definitions of terms and answers to other Internet security-related questions.

boot sector virus

There are two types of boot sector viruses: the MBR and the DOS boot sector. The MBR virus is a small program the BIOS executes to start the boot process. The DOS boot sector virus targets the volume boot code affecting the disk parameter block which holds information about the volumes on a disk. Either of these sectors may be an infection host.