SD card slot on R530/430? How can I use it?

Howdy,

I noticed there is an SD card slot on the back of our latest servers.  It has a wrench on it so I'm not sure if it's a normal card slot or not.

I tried putting a card in there but nothing shows up in Windows.  I saw some things about having to enable it in System Settings but I didn't see any settings when I looked around.

Can anyone let me know what this card slot is for?  We want to put a Windows Image on it so if we ever have to rebuild a server we don't have to go find a CD or plug in a USB drive.  I don't know if we can use it for that or not.

I think our x20 models also had a slot but it was in the front.  Do those work the same way?

Any guidance would be great.

Thanks.