Função para buscar o número serial do hd

Function SerialNumHD(FDrive:String) :String;
var
Serial:DWord;
DirLen,Flags: DWord;
DLabel : Array[0..11] of Char;
begin
try
GetVolumeInformation(PChar
FDrive+':'),dLabel,12,@Serial,DirLen,Flags,nil,0);
Result := IntToHex(Serial,8);
except
Result :='';
end;
end;