Just to refresh my memory, i would like to share this small article to you. This should help for some “computer guy” with limited memory–including myself– to remember every “computer’s command syntax” 
Windows 7 includes a disk checking tool called CHKDSK which is similar to the “scandisk” tool from older versions of Windows. This application scans your hard drives for errors such as lost sectors, bad sectors and corruption.
You can launch CHKDSK using two methods, Graphical Interface or Command Prompt (the former being the easiest). To use Graphical Interface, I believe, you don’t need to read any help. It’s just click and play . With Command Prompt, some of us might be faced a problem regarding the syntax. Hope it will help.
You can use the command prompt to perform a scan on a drive letter of your choice by running “chkdsk x:” where x is your drive letter. The manual scan options are:
- /F Fixes errors on the disk.
- /V On FAT/FAT32: Displays the full path and name of every file on the disk. On NTFS: Displays cleanup messages if any.
- /R Locates bad sectors and recovers readable information (implies /F).
- /L:size NTFS only: Changes the log file size to the specified number of kilobytes. If size is not specified, displays current size.
- /X Forces the volume to dismount first if necessary. All opened handles to the volume would then be invalid (implies /F).
- /I NTFS only: Performs a less vigorous check of index entries.
- /C NTFS only: Skips checking of cycles within the folder structure.
- /B NTFS only: Re-evaluates bad clusters on the volume (implies /R)
“CHKDSK x: /F /R” would perform a full scan (including bad sectors) and attempt to fix them.
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