To change disk letter you can use Disk part (You can find it in "Disk
Management Command Line Utility" component).
Open command prompt and digit:
diskpart
select disk [n° disk]
select partition [n° partition]
assign letter= [letter]
If you like to change letter on first boot, you can create a RunOnce
component containing two files:
1) a file .Bat; calling a file.txt, eg: diskpart /s C:\
changedriveletter.txt
2)a txt file containing commands
