SD Memory Serial Number

Hello

I'm trying to get the Unique Serial Number of an SD (Secure Digital) Memory Card, I know how to get the volume information and the like. From reading the specification for the SD Card, I do know each has such an Unique ID. After doing many search here, google, and other web sites I haven't been able to find the answer.

Thanks as always for any help you can provide

So nobody has any idea at all?