Option 1: Create separate system and boot volumes. This should be used in scenarios where NTFS cluster sizes greater than 4096 bytes (4K) are needed or desired.
System volume: Create a small volume to hold the BOOTMGR files (100MB is sufficient). Format the volume with a cluster size less than or equal to 4K
Boot volume: Create a second volume to hold the Windows operating system files. The cluster size can be greater than 4K (NOTE: File compression is not supported on volumes with NTFS cluster sizes greater than 4K)
Boot from Windows installation media.
Press Shift+F10 at the first setup screen to open a command prompt.
Run the following commands to create the partitions:
diskpart
select disk 0
create partition primary size=400 [this will be the system volume and will be formatted with a cluster size <= 4K]
active
format fs=ntfs label=”System Reserve” quick
create partition primary [this will be the boot volume, of any size, and formatted with the desired cluster size (8K in this example)]
format fs=ntfs label=OS_8k unit=8192
assign
exit
Then complete setup, deploying the Windows operation system to the second partition (not the 400mb partition)
Option 2: Choose the cluster size that is less than or equal to 4K if you want to have system/boot volumes on the same physical volume.