Once the partitions are created, you need to "prime" the drive so the Xbox recognizes it as a bootable device. Open the file you downloaded from Microsoft. Locate the $SystemUpdate folder.
While there are newer methods involving "scriptless" formatting, the method remains popular because it: xboxonehddmaster9 install
Ensure no other programs (like Disk Management) are using the drive. Once the partitions are created, you need to