You would run "CHKDSK [drive letter] /R" if you wished to repair file system errors on your computers hard drive. This is mostly a legacy command for DOS and old Windows operating systems.
you can run chkdsk from dos. If you are using windows, you would need to open a command prompt (usually located in the accessories folder) and then type chkdsk in the ensuing prompt. you can type chkdsk /? for commands that you can use with chkdsk.
chkdsk /f and chkdsk /r read ur text book...
chkdsk\r
on windows "chkdsk /r"
chkdsk /r Locates bad sectors and recovers readable information. chkdsk /f Fixes errors on the disk. The disk must be locked. If chkdsk cannot lock the drive, a message appears that asks you if you want to check the drive the next time you restart the computer. chkdsk /p Performs an exhaustive check even if the drive is not marked for chkdsk to run. This parameter does not make any changes to the drive.
/F fixes errors on the disk and /R locates bad sectors and recovers readable information
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You can use the chkdsk command with the /f or /r switch in a command prompt window to check and fix errors on a disk without requiring a restart, as long as the drive is not the system drive. For example, you can run chkdsk D: /f to check and fix errors on the D: drive. However, if you attempt to run it on the system drive (usually C:), you will be prompted to schedule the check for the next system restart.
Depending on the issues encountered, and disk speed, it may take many hours.
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For Windows 95, 98 and ME Disk Cleanup, Scandisk Defrag _________________________ For Windows 2000 / XP Disk Cleanup, Defrag, chkdsk/r
a CD-r is a CD you record.