I believe the sound is coming from the hardware as we do not have a switch config for this (check to see if you are using the monitoring options located in Hardware options - CTRL + ALT + W from the Console screen). Usually with some RAID controllers and system BIOS settings the alarms can be set for this. If the RAID has completed building and the alarm is still continuing then could be something else.

Make sure to save your settings in Main. > Misc. when switching out from the Demo-CD to the USB module just as a backup, but you should not have any problems with your data and settings.