Here the virus captures control and informs it that the present memory is less than that available on the hardware. The boot record contains information called the boot strap which directs the ROM BIOS to load a DOS.Īs the virus affects the boot record and remains in the first sector of the disc, resulting in the DOS getting loaded below the virus. If the computer is affected by it, the computer cannot be booted. For example, C-Brain virus resides in the zero or boot sector of the disc especially in the innermost circle of the disc which contains boot record or boot cluster. The computer virus attack on the boot sector of the hard disc or floppy disc. On the hard disc, virus can occupy DOS boot sector or master boot sector. It hides the rest of itself elsewhere on the disc with the copy of the first sector. It affects the disc by replacing the first sector on the disc with part of itself. Boot Virus:īoot virus enters the boot sector of a floppy disc. It spreads to other computers when the affected programs are copied. As soon as the host program is executed, the parasitic virus is activated. Parasitic virus attacks the computer and its programs when the host program is executed.
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