procedure TForm1.Button1Click(Sender: TObject);
begin
  case GetDriveType('C:\') of
    0: ShowMessage('The drive type cannot be determined');
    1: ShowMessage('The root directory does not exist');
    DRIVE_REMOVABLE: ShowMessage('The disk can be removed');
    DRIVE_FIXED: ShowMessage('The disk cannot be removed');
    DRIVE_REMOTE: ShowMessage('The drive is remote (network) drive');
    DRIVE_CDROM: ShowMessage('The drive is a CD-ROM drive');
    DRIVE_RAMDISK: ShowMessage('The drive is a RAM disk');
  end;
end;