Hello. Following is the excerpt from my </ CreatePartitions>. But I would like the C: were removed and recreated with the installation of the OS, using only the unallocated space and preserving the remaining partitions. <DiskConfiguration> <Disk wcm:action="add"> <ModifyPartitions> <ModifyPartition wcm:action="add"> <Active>true</Active> <Extend>false</Extend> <Format>NTFS</Format> <Label>System</Label> <Letter>C</Letter> <Order>1</Order> <PartitionID>1</PartitionID> </ModifyPartition> <ModifyPartition wcm:action="add"> <Active>false</Active> <Extend>false</Extend> <Format>NTFS</Format> <Label>Data</Label> <Letter>D</Letter> <Order>2</Order> <PartitionID>2</PartitionID> </ModifyPartition> </ModifyPartitions> <CreatePartitions> <CreatePartition wcm:action="add"> <Order>1</Order> <Size>51200</Size> <Type>Primary</Type> </CreatePartition> <CreatePartition wcm:action="add"> <Extend>true</Extend> <Order>3</Order> <Type>Logical</Type> </CreatePartition> <CreatePartition wcm:action="add"> <Order>2</Order> <Extend>true</Extend> <Type>Extended</Type> </CreatePartition> </CreatePartitions> <DiskID>0</DiskID> <WillWipeDisk>true</WillWipeDisk> </Disk> </DiskConfiguration> Sorry for the poor english. Thank you.