Which command is commonly used in Windows to check disk integrity?

The command commonly used in Windows to check disk integrity is CHKDSK. This utility scans the file system and file system metadata of a volume for logical and physical errors. When executed, CHKDSK analyzes the disk surface and checks for bad sectors while verifying the integrity of the file system.

CHKDSK can be run with different parameters to not only check for integrity but also to repair issues it finds. For instance, using the '/f' switch will attempt to fix any found errors, while the '/r' switch will locate bad sectors and recover readable information.

The other commands listed serve different purposes: DISKPART is used for partition management, allowing users to create, delete, or resize partitions. FORMAT is used to prepare a disk for use by erasing the current file system and creating a new one. The REPAIR term, while hinting towards fixing issues, is not a specific command in Windows but rather part of functionality that could emerge from running CHKDSK with the right parameters or it may refer to various repair options for system or applications. Thus, CHKDSK is specifically designed for checking and maintaining disk integrity.