Scandisk with Dos

When you scan the disk, if the disk can't scan so scan with this method.

Go to Start=> Run
Here you type " cmd " and hit Enter.
Now dos command prompt window will be open and here you type.

chkdsk /x /f /r [ Drive Name ]

Example: chkdsk /x /f /r D:
And hit Enter.
D: is the drive name.