Here's a utility I wrote for GBM users wishing to toggle their SD Card Readers on and off. Specifically form this forum thread.
The app will basically install the devcon utility (which is what is actually enabling and disabling the device) into the c:\temp folder. The app is a simple toggle, if the SDHost Device is enabled, it will disable it. If it is disabled, it will enable it.
(note: it usually takes longer to enable than to disable)
This was Written in Autoit V 3.2.2.0
I'm open to suggestions so feel free to comment.