Which of the following should be regularly scheduled to fix hard drive errors?

Disk Defragmentation rearranges fragmented files to improve read performance on HDDs but does not detect or repair file system errors or bad sectors.

Check Disk (chkdsk) performs two levels of diagnosis: it verifies and repairs file system metadata integrity (lost clusters, cross-linked files) and optionally scans for bad sectors on the physical drive surface using the /r switch. Scheduling regular chkdsk runs allows Windows to identify and isolate developing drive errors before they cause data loss, making it the correct tool for fixing hard drive errors.

System Restore creates and rolls back to snapshots of system files and the registry, but it does not scan or repair hard drive file system errors.

An antivirus scan detects and removes malicious software but has no capability to identify or fix file system errors or physical drive problems.