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.
>
>>Does anyone know where I can find out detailed information on how volume serial numbers are created and read?
>>
>>I thought it was basically a somewhat unique ID number created when the disk was formatted or in my case burned. I am finding out it actually changes from OS to OS so the CD I burned has a Volume Serial Number of 5679681780 on my Windows XP machine but the same CD shows the number 4094724434 on my Windows 98 machine.
>>
>>Any information would be helpful.
>>
>>Thanks,
>>
>>Ron