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This option only appears on a server that is a domain controller (and, therefore, it isn’t shown in Figure 2-4). Directory Services Restore Mode (DSRM) is a special form of Safe Mode made for domain controllers that allows you to repair or recover an Active Directory database.

To use this utility you need to know the DSRM password that was set when the domain controller was initially created. If you don’t know the password, you can use the ntdsutil tool to change the password. You need to have access to the Command Prompt on the system in question to run it.

If all of this is Greek to you, don’t worry! I cover Active Directory in depth in Book 2, Chapter 5. For now, think of Active Directory like a special database that stores information on users, computers, sites, and other objects in your network. This database can be crucial to your organization, so knowing how to restore it if it becomes damaged is a very useful skill.