Most of the info is here
[https://redmondmag.com/articles/2014/10/23/rebuild-windows-storage-spaces.aspx]
and here Technet
[https://technet.microsoft.com/en-us/library/dn782852(v=ws.11).aspx], but for
easy step by step, follow below:
1. Open PowerShell
2. Identify the disks you want to remove using:
Get-PhysicalDisk