Active Directory data is stored in the Ntds.dit ESE database file. Two copies of Ntds.dit are present in separate locations on a given domain controller:
%SystemRoot%\NTDS\Ntds.dit This file stores the database that is in
use on the domain controller. It contains the values for the domain and a
replica of the values for the forest (the Configuration container data).
%SystemRoot%\System32\Ntds.dit This file is the distribution copy of the
default directory that is used when you promote a Windows 2000 – based computer
to a domain controller. The availability of this file allows you to run the
Active Directory Installation Wizard (Dcpromo.exe) without your having to use
the Windows 2000 Server operating system CD. During the promotion process,
Ntds.dit is copied from the %SystemRoot%\System32 directory into the
%SystemRoot%\NTDS directory. Active Directory is then started from this new
copy of the file, and replication updates the file from other domain
controllers.
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