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#21
This isn't rocket science. Chkdsk checks and repairs the low level structure and physical integrity of the disk storage format. Windows depends on a huge number of system files for correct operation. Sfc checks that all required system files exist and have the correct version installed on your PC. Sfc attempts to fix any problems with such files.
I just use chkdsk <volume> /f and sometimes use the /spotfix option for speed.