Resetting the DNS-343 to the factory default settings will not impact your HDD configuration, data, or data access. If you chose to reset, I recommend you save a copy of your "configuration file" to your desktop so you can restore your settings (e.g. shares, etc). Even if you save a configuration file, avoid using it until you validate/determine the cause of the issue you're encountering. Loading the configuration file may cause the issue to come back.