What is Boot sector-Virus?
A boot sector virus is a computer virus that infects the master boot record (MBR) of a storage device. It is not mandatory for a boot sector virus to successfully start the victim's computer in order to infect them. Therefore, even non-bootable media can trigger the spread of boot sector viruses. These viruses copy their infected code either to the boot sector of the floppy disk or to the partition table of the hard disk. During startup, the virus is loaded into the computer's memory. Once the virus is stored in memory, it infects the uninfected hard drives that are in use by the system.
Boot sector virus spread has become very rare since floppy disks fell into disrepair. In addition, today's operating systems include boot sector safeguards that make it difficult for boot sector viruses to infect them.
Boot sectors exist on storage media such as hard drives, floppy disks, or occasionally CDs and DVDs. During the boot process, the boot sector program is automatically located by the hardware and then loaded. The boot sector then loads the remaining part of the operating system into memory. It is impossible for a computer to load the operating system without a boot sector.
A boot sector virus usually infects the computer by modifying the boot sector program. The virus replaces the standard program with its own damaged version. A boot sector virus can only infect a computer if the computer is started up with the virus. The computer will not be infected if the virus starts up or if the computer is running the operating system.