Finding a TS Client's SD Drive

I'm dealing with an application that needs to run on a Win 2003 TS and it
needs to find the client's secure digital storage card reader.

When dealing with the application when actual app is running on a local
system, the App is using GetDriveType to look for a drive letter of type
DRIVE_REMOVABLE and then using GetDiskFreeSpace to see if it is of an
expected SD size. This returns a drive letter that is then used by the app
to read/write from/to the SD card.

These APIs do not function when the SD driver when it is exposed to TS
client settings using the Local Resources / Connect local Disk Drives.

Although the SD drive shows up in something as simple as the TS session's
explorer, explorer can't even display any properties of the SD drive other
than the file(s) / contents of the SD card.

Is there a more advanced or WTS specific API or other API that can by used
to "find" the client's SD reader within a TS session?