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Run CHKDSK to check for disk errors .

1.        Click Start > Run.

2.        In the Run box, type the following text:

Cmd

3.        Click OK.

4.        At the command prompt, type the drive letter of the drive you want to check (followed by a colon), and then press Enter.

 For example, to check drive D, type the following text:

d:

5.        Change to the root directory of the drive by typing the following text and pressing Enter:

cd

6.        Type the following text, and then press Enter:
chkdsk /<switch>

 where <switch> is one of the following: 

If you want to automatically repair file system errors, use the /f switch (for example, chkdsk /f).
If you want to both repair file system errors and scan for and recover bad sectors, use the /r switch (for example, chkdsk /r).
If you do not specify a switch when running CHKDSK, any errors that are found will not be fixed.

7.        if you are prompted to schedule CHKDSK to run the next time the computer restarts (because CHKDSK may be unable to gain exclusive access to the drive under Windows), type the following text, and then press Enter:

 y

8.        At the command prompt, type the following text, and then press Enter:

 Exit

9.        if you had to schedule the CHKDSK operation, then restart Windows NT/2000/XP.

 While Windows is loading, CHKDSK should automatically run and check the drive that you specified earlier.

Note: Symantec recommends that you run CHKDSK a second time if any errors or bad sectors are found on the disk. Continue running CHKDSK until all errors and bad sectors have been fixed.

CHKDSK, 坏道