with [Data] AutoPartition=0 [Unattended] Repartition=No FileSystem=* he will have a format option by simply pressing Enter on desired (preselected) partiton... (D, L , ENTER sequence is not required) @Regielya: with this option, you insert CD and boot from it, when partitiong (after one minute or less) comes press Enter on an already selected C partiton, choose formating as a NTFS or FAT, confirm, and that's it! D, E & F drives will stay intact.