Because it downsized the scale of the computer itself.
Answer:
On the screen where you select the disk to install Windows, click "Load Driver"
Explanation:
While the user has Windows installed on a new system. Instead, he configures several hard disks in such a RAID 5 series using the RAID controller onto the motherboard. The user is left unpartitioned and improperly formatted in the list. He edits that boot request from either the optical drive for the BIOS to boot. He installs DVD drive, begins the configuration, and boots to the disk.
Then press the "Load Driver" button on the monitor where he picks the disk to install Windows
