the fact you are having problems with this one folder, suggests it is corrupt, which probably caused the failure when attempting to write to it,and subsequently when trying to read it..
If you go to the disk makers website, there is probably a utility program for testing the disk and maybe erroring any dodgy sectors.
Before running this, make sure you have all your information backed up elsewhere.
As suggested earlier, if possible first delete the suspect folder, . But this alone could be releasing a damaged part of the disk for use in the future. Which could then cause a far more serious problem.
Please advise back on progress.
Good Luck - Keep us posted.