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When you use the Diskpart.exe tool to assign drive letters for partitions in the Microsoft Windows Preinstallation Environment (Windows PE) phase, and then you install Windows Server 2003 by using an unattended file, drive letters change automatically in Windows Server 2003.
To resolve this problem, use one of the following methods:
Set the size of the second partition on the same drive.
Make the first partition of the second drive active.
Take the following actions:
Add the following section into the unattended file: