Answer:
boot sector virus
Step-by-step explanation:
Traditional data storage devices include hard disk, optical disc, and floppies. These devices are divided into MBR and VBR.
The master boot record is partitioned while the volume boot record is not partitioned.
MBR contains the machine instructions needed to boot the computer. VBR contains information regarding the volume usage of the disk.
The boot sector is present either in the MBR or in the VBR.
The boot sector on a storage device contains the machine language instructions needed to boot the computer. These instructions are loaded into the memory which is executed by the BIOS application of the computer.
If the boot sector on a hard disk is damaged, the disk becomes useless and cannot be used to boot the computer.
One of the traditional viruses, boot sector virus, boot sector virus is loaded on a removable media. The media is connected to the computer. On system boot, the virus transfers from the removable media into the computer.
The types of boot sector virus are MBR virus and DOS boot sector virus.
MBR virus, as explained above, is executed by the BIOS of the computer.
DOS boot sector virus is present in the VBR. This virus affects the information regarding the volumes of the disk. This information is present in the VBR itself.
Prevention
This virus can be prevented periodic scanning of the computer and the files.
The computer and programs should be monitored for any activity which is uncommon.
The best method is using anti-virus software.
Another method is keeping back up of the information.
The disks should be locked before using a new computer. The disk should be unlocked only after ensuring that the computer does not carries any virus.
The computer containing virus should be isolated from the network and its usage should be delayed until completely free of virus.