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#11
tritous,
Don't worry. Chkdsk is not going to mangle anything. True is that if the hard disk is going south then any use of the disk can be the last.
What I do recommend is that you immediately copy any data dear to your heart from that disk to a USB drive or USB stick or even to your new hard dirve.
After you have the data copied over, then definitely run:
CHKDSK C: /R
here I've used C: where you will want to use the appropriate drive letter.
The /R is going to check the entire disk, even where you don't have data and is going to mark any bad sectors as bad so that the drive does not try to use those sectors.
In the old days, we had to specify both /F and /R but now /R includes /F.