perf – to use more computer resource to perform a scan as fast as possible. forceofflinefix – to bypass all online repair and queue all defects for offline repair. scan – to run an online scan on the volume. The following switches are new in Windows 8 and carried over in Windows 10. But it gets improved a lot with more options in Windows 8.1 and 10 since Microsoft improved the health model of NTFS as well as the way how it fixes the file system corruptions. There are only a few switches available in CHKDSK you can use in Windows 7 systems. Users can use it manually to check the disks or external flash drives for errors. It starts automatically during the boot when the system partition was marked dirty due to an unexpected shutdown, or bad sectors.
It can also check the disk surface for bad sectors and mark them.
CHKDSK, short for Check Disk, is a Windows system command line tool that verifies the file system integrity of a disk volume and fixes logical file system errors.
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