Cheer's for the replies guy's.....So could I just tell it to format C: in the win.sif file or would that format the D: partition too. I seem to remember a batch file that could do this in 32 bit, but never seen it in NTFS....is there not a way of doing it in NTFS Dos, before starting the unattended set up process.....sort of load NTFS Dos first then continue the install process, I can see why its not freely available, as if you accidentaly pressed at the wrong time youv'e lost your data, but there must be a way around it........Com on you super programmers who programed the installers for the software please help out if you can.... cheer's guy's