Part of the licensing scheme of my app depends upon an expansion card
having a unique identifier, as returned by ExpCardInfo() in the
deviceUniqueIDStr field.

I have not found anywhere that definitively states whether all SD cards
on the market will indeed have a unique ID string.  Is the
implementation of this UID mandated in the spec for SD?  Or do vendors
just implement this out of the kindness of their hearts, and it's
probable that some SD cards might not have a UID, or that it might be
identical to another SD card out there somewhere, etc?

In addition to SD cards, any ideas about the reliability of a UID field
for the other ExgMgr-supported expansion card media types? (MemoryStick,
CF, SD, MMC, SmartMedia, RAMDisk)

I don't know where to begin looking for this kind of information, tips
appreciated.

Thanks!
-Jeff Ishaq


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