In this case take a look at http://www.microsoft.com/technet/prodtechnol/winxppro/reskit/prkd_tro_ilxl.asp

>Thanks Sergey,
>
>But I am looking for more detailed information. I know how the API call works but what I want to know is what is it actually reading. Why it would be different on different Operating Systems. What actually creates it, etc...
>
>>See GetVolumeInformation API #12653.
>>