The unit has a limitation that it can download up to 1000 domainusers. If you want to use domain user accounts, you will need to usethe Delegate Authority to an external SMB Server option. To do this,select Workgroup and put a checkmark in the "Delegate Authority toExternal SMB Server", "Use Windows Domain Controller as AuthenticationServer", "Automatic User Registration", and "Authentication SharedFolder" and enter the required information. The "Authentication SharedFolder" option will create an open share. Have the domain users thatare to access the unit login to that share. This will register thoseusers on the Terastation. Afterwards, you can set Access Restrictionson the shares using those users and remove the "Authentication SharedFolder".