Disk scanners are
Disk scanners are anti-virus protection systems.
Scan Disk is a Windows utility used to check your hard disk for errors and to correct problems that are found. These errors often occur when Windows locks up and must be restarted.
Anti-virus:-
Antivirus software also known as anti-malware, is a computer program used to prevent, detect, and remove malware.
An anti-virus scanner is a component of an anti-virus software package that scans a hard drive for viruses and other harmful items.