procedure TForm1.Button1Click(Sender: TObject);
var
  VolumeName,
  FileSystemName     : array [0..MAX_PATH-1] of Char;
  VolumeSerialNo     : DWord;
  MaxComponentLength,
  FileSystemFlags    : Integer;
begin
  GetVolumeInformation('C:\',VolumeName,MAX_PATH,@VolumeSerialNo,
 
  MaxComponentLength,FileSystemFlags,
 
FileSystemName,MAX_PATH);
  Memo1.Lines.Add('VName = '+VolumeName);
  Memo1.Lines.Add('SerialNo = $'+IntToHex(VolumeSerialNo,8));
  Memo1.Lines.Add('CompLen = '+IntToStr(MaxComponentLength));
  Memo1.Lines.Add('Flags = $'+IntToHex(FileSystemFlags,4));
  Memo1.Lines.Add('FSName = '+FileSystemName);
end;