/R: The /R switch tells chkdsk to attempt to recover any bad sectors of the hard drive if any are found. A bad sector is a spot on the hard drive that can’t hold saved data anymore.

/I: The /I switch tells chkdsk to perform a less detailed but faster disk check.

/C: The /C switch tells chkdsk to skip the checking of cycles within a folder structure which reduces the scan time. Don’t ask me what this means.

An example of an exhaustive disk check using the command line interface is:

chkdsk D: /F /R

The check disk command shown above will fix any errors it finds and also attempt to recover bad sectors of the D: drive if any are found.