Microsoft ought to publish any extra steps that might be taken within the GetVolumeInformation() Win32 call to come up with a serial number. I view this as a Microsoft BUG, because there really is a serial number in these SD cards, and these two routines under different Microsoft operating systems purport to give the serial number - but they do not match. (yes, I tried the same SD card both places) I've been trying to do the same thing as the original poster, however, the GetVolumeInformation under Win32 does NOT return the same number as the DeviceIoControl(.GET_STORAGEID) does under a PocketPC. There is a way to get a serial number of a disk under Win32 C/C++, using GetVolumeInformation. The above answer from someone at MSFT is not helpful.
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