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