Hard diskin seri numarasını bulur. 
procedure TForm1.Button1Click(Sender: TObject); 
var
VolumeSerialNumber : DWORD; 
MaximumComponentLength : DWORD; 
FileSystemFlags : DWORD; 
SerialNumber : string; 
begin
GetVolumeInformation('C:\', nil, 0, @VolumeSerialNumber, 
MaximumComponentLength, FileSystemFlags, nil, 0); 
SerialNumber := IntToHex(HiWord(VolumeSerialNumber), 4) + '-' + IntToHex(LoWord(VolumeSerialNumber), 4); 
Memo1.Lines.Add(SerialNumber); 
end;