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;