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The problem is not that bad. If it was okay before you went to bed, then maybe it just was not dismounted correctly.
There's a couple of ways of fixing it depending on the OS, type of drive, physical size and whether it's internal or external.
It happens to me when I neglect to dismount the drive before removing it.
If it's in a laptop, you can remove it and put it in a usb drive case and retrieve the data on a different computer.
Hope it helps.
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