During the last days I experienced a data loss because one of the data blocks on the hard disk seems to get damaged.
How do you know this is the reason you are losing data? Your system should not be saving data to that block in the first place. If it tries, you should be getting a write error.
I recommend you run Error Checking on the drive or chkdsk /r from a command prompt. When prompted to let it run at next boot, allow that, then reboot. If it finds bad sectors, they will be blocked as unavailable.