DISKPART
SELECT DISK 0 // Select the first hard drive
CLEAN // Wipe the disk
CREATE PARTITION PRIMARY SIZE=300 // Create the system partition
FORMAT QUICK FS=NTFS LABEL="System" // and format it using NTFS.
ACTIVE // Label and assign a letter
ASSIGN LETTER="S" // to the partition.
CREATE PARTITION PRIMARY // Create the Windows partition
FORMAT QUICK FS=NTFS LABEL="Windows" // that fills the remainder
ASSIGN LETTER="C" // of the extended partition
EXIT