Hy JavaLawyer..
Previous NAS firmware version is v1.00, after follow your instructions, RESET>upload latest version firmware 1.0b03 (download from Dlink official website).. then I need to do Setup Wizard again (like first time).. After formatting Hard drive, I upload a few data like picture, movie and etc..
The result is same after shutdown or switch off the ShareCenter DNS-320L.. I mean after login back, system suggest to me Set RAID again..
Tomorrow I will take my DNS-320L and send to Dlink Local agent (Malaysia) for trouble shooting. (because still under warranty)
Thanks for your support!!