Data and/or file structures on the drive may be corrupt. Run the check disk program or other disk validation and repair utility on the drive. To do this:
Open Explorer or My Computer (Press Windows+E).
In the right pane, right-click on the drive you want to validate and select Properties.
Select the Tools tab.
Under Error-checking, click on "Check Now".
In the next dialog, make sure the option "Automatically fix file system errors" is checked. If you want a more complete validation and repair check the option "Scan for and attempt recovery of bad sectors" (although this takes considerably longer to complete).
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