The GetVolumeInformation function returns a lot of info about volume, including a volume serial number and a volume label. See Win API#12653. Every time HD is formatted, the volume serial number changes too.

>As far as I've leard this funcion exemplo available
>at UT, returns a combination of label and serial.
>The problem is that everytime client formats his
>HD, he has to call and ask a new password.
>
> How can do to retrieve only serial number and not label ?
>
>Thanks
>Moises