Which tool is utilized to verify the integrity of a disk in a Windows operating system?

The tool used to verify the integrity of a disk in a Windows operating system is CHKDSK. This utility checks the file system and file system metadata of a volume for logical and physical errors. When invoked, CHKDSK can scan for corrupted files, bad sectors, and other discrepancies that may affect the performance and reliability of the disk. If errors are found, it can attempt to fix them, thereby helping to maintain the overall health of the storage device.

Other tools mentioned serve different purposes: Disk Cleanup helps free up disk space by removing unnecessary files, Defragmenter reorganizes fragmented data on the disk to improve read/write efficiency, and Task Manager provides information about system performance and running applications but does not check disk integrity. Thus, CHKDSK is specifically designed for monitoring and repairing disk integrity issues.