Files disappeared from the HDD after a reboot, but the disk did not become freer, what should I do?

Question

Hard disks

Hello. There was a reboot and after that files disappeared in some folders, but the strangest thing is that the disk did not become freer, that is, they were not deleted, but simply they were not there. Tried to find files using find but found nothing. What can be wrong? Is it possible to recover files?

Answer 1

Checkdisk to help

Answer 2

Photorec walk through