Use CHKDSK in Windows 7 to check hard drives, USB drives, or SD cards.
Use CHKDSK in Windows 7 whether you can access it or not. It automatically finds and repairs errors on hard drives, USB drives, or SD cards in mobile phones and cameras.
IMPORTANT:
The CHKDSK scan can take a long time (even several hours) if you're scanning a large hard drive. And you usually can't cancel it until it's finished. Keep this in mind.
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