I know there are many topic asking the same question. But I think my situation is a bit different to the others. I need to deploy Win7 to client computer by WDS by using unattend file to automate it. The client computer had C: drive (system) and D: drive (Data) which already exist. What I want is just wipe the C: partition and deploy Win7 to that partition again, D: partition must be intact. The current partition ID of the disk is : partition 1 = system reserve, partition 2 = C:, partition 3 = D: Below is the content of my unattend.xml -<DiskConfiguration>- <Disk wcm:action="add">- <ModifyPartitions>- <ModifyPartition wcm:action="add"> <Active>true</Active> <Format>NTFS</Format> <Label>CPart</Label> <Letter>C</Letter> <Order>1</Order> <PartitionID>2</PartitionID> <TypeID /> <Extend>false</Extend> </ModifyPartition> </ModifyPartitions> <DiskID>0</DiskID> <WillWipeDisk>false</WillWipeDisk> </Disk> <WillShowUI>OnError</WillShowUI> </DiskConfiguration>

Hi, I am afraid you should use MDT: http://www.microsoft.com/downloads/en/details.aspx?familyid=3bd8561f-77ac-4400-a0c1-fe871c461a89&displaylang=en MDT provides advanced deployment features: MDT forum: http://social.technet.microsoft.com/Forums/en/mdt/threads Tim Quan