![]() ![]() Warning: Even a non-bootable floppy can contain a virus in the boot sector. This sector is rewritten whenever you do a “SYS” or a “FORMAT /S” to a disk. Damage to this sector can make your disk appear to be unreadable. Since the DOS boot sector is executed every time you power on or boot your PC, it is very vulnerable to virus attack. Bootable CD-ROMs, if infected by whomever wrote out the disc, could also be the source of an infection. Other removable devices have DOS boot sectors that are defined by the format utility for that device. ![]() This special sector is numbered 0,0 and is called the Boot Sector.Ī hard disk also has a DOS boot sector, but it’s located in a different sector on the hard disk (see note below). storing a short program that either puts a message on the screen saying the disk cannot be used to start the computer if it’s a data disk, or a short program that starts to load the operating system if it’s a system disk which can start the computer (boot disk).storing information about the disk, and.Even a non-bootable floppy can contain a virus in the boot sector.When a floppy diskette is formatted (it doesn’t matter if it’s a system or data disk) the very first portion of the disk is set aside for two main purposes:
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