Speed - Property in wmi

List of namespaces with Speed property

NameSpace	n of Classes
ROOT\CIMV2	4
ROOT\CIMV2\ms_409	4
ROOT\CIMV2\storage\iscsitarget	4
ROOT\Microsoft\Windows\Storage	1
ROOT\Microsoft\Windows\Storage\MS_409	1
ROOT\Microsoft\Windows\Storage\SM	2
ROOT\Microsoft\Windows\Storage\SM\ms_409	2
ROOT\StandardCimv2	3
ROOT\StandardCimv2\MS_409	3
ROOT\virtualization\v2	15
ROOT\WMI	2
ROOT\WMI\ms_409	2