-- Get a list of the available drives.
drives = Drive.Enumerate();

-- Determine if an error occurred.
error = Application.GetLastError();

-- If an error occurred, display the error message.
-- If no error occurred, display the available drives in a dialog.
if (error ~= 0) then
    Dialog.Message("Error", _tblErrorMessages[error], MB_OK, MB_ICONEXCLAMATION, MB_DEFBUTTON1);
else

    -- Create a string consisting of all of the drive letters and display them.
    all_drives = Table.Concat(drives, "\r\n");
   CheckBox.SetText("CheckBox1", ""..all_drives);

end