Drive letters change automatically in Windows Server 2003 when you use the Diskpart.exe tool to assign drive letters

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Symptoms

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.

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Resolution

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:

[GuiRunOnce]
Command1=C:\PostOs\diskpart.bat 

C:\PostOs\diskpart.bat contents: diskpart.exe /s c:\PostOs\diskpart.txt 
format D: /fs:ntfs /q /y [optional command]
format E: /fs:ntfs /q /y [optional command]
format F: /fs:ntfs /q /y [optional command]

Add Diskpart.txt and Diskpart.bat to the distribution folder.

Add text to the C:\PostOs\Diskpart.txt file that resembles the following text:

select disk 0
create partition primary 
assign letter=e
select disk 1
clean
create partition primary size=14000 [Sizes may vary according to your 
need]
assign letter=d
create partition primary
assign letter=f

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