>If I understand you correctly, you want to get hard drive serial number, not volume serial number. But both methods that you are using, they return volume serial number. Probably you need to use Win32_PhysicalMedia objects instead of Win32_LogicalDisk.
>
>This may help:
>http://www.codeproject.com/KB/cs/hard_disk_serialno.aspx

The second method returns the drive serial number. It is just that I was storing it into cVolumeSerialNumber. I have adjusted the method since then. That one is for the drive serial number.

Thanks for the reference