A boot scan, also known as pre-boot scan or shoe scan, virus scanner is an advanced device that is used by antimalware software programs to detect and eliminate malware that might not be detected using traditional scanning tools. This type of scan can be configured to run on a regular basis or can be manually invoked by the user when they suspect that their system is infected. Many antivirus programs allow users to select the sensitivity level for the boot scan, as well as what actions should be taken if a threat is detected.
The reason why a boot scan can be so efficient is that it allows the antimalware program detect files that are used by the operating system. These files aren’t able to be deleted as they are constantly accessed by the OS. They will give an Access Denied message when you try to remove them. The boot scan will identify these files and permit antivirus software to remove them before the OS can use them.
The duration of a scan during boot can vary based upon a variety of factors, such as the speed and amount of system files being examined. It also depends on whether the computer is in use during the scanning process. This type of scan can take much longer than a standard anti-virus scan due to the thoroughness of the process.