Building my new Lab I found something interesting.
I want to create a StorageSpaces but as minimal as possible just for showing and I don’t want to carry 100Gb disks just as place holder.
So I created 1GB disk
New-VHD –Path S:Data1.VHDX -Fixed -SizeBytes 1GB
Mounted this to the Server and want to create a Storage Pool But there are no disk in the Storage pool.
So a quick get-physicaldisk showed me the canpool is False !
Strange why is the value False ?
also checking this it showed me “ Insufficient Capacity “ Oh ok so there is a limit a Bing did not showed me this. So where is the limit 
Get-PhysicalDisk -FriendlyName PhysicalDisk4 |fl
AllocatedSize : 1000204886016
BusType : ATA
CannotPoolReason : Insufficient Capacity
CanPool : False
Description :
DeviceId : 4
I created a few disks and did some testing.
New-VHD –Path S:Data1.VHDX -Fixed -SizeBytes 2GB
New-VHD –Path S:Data1.VHDX -Fixed -SizeBytes 3GB
New-VHD –Path S:Data1.VHDX -Fixed -SizeBytes 6GB
New-VHD –Path S:Data1.VHDX -Fixed -SizeBytes 10GB
New-VHD –Path S:Data1.VHDX -Fixed -SizeBytes 20GB
You need at least a 4GB disk! I could not find any guidance on this now in the real world this would not be a problem
Now I can create My StorageSpace
More Info On storageSpaces :
Storage Spaces Overview http://technet.microsoft.com/en-us/library/hh831739.aspx
