def METHOD_NAME():
    """ Locate the built-in device storage that user can see via file browser.
        Often found at: /sdcard/
        This is storage is SHARED, and visible to other apps and the user.
        It will remain untouched when your app is uninstalled.
        Returns directory path to storage.
        WARNING: You need storage permissions to access this storage.
    """
    if _android_has_is_removable_func():
        sdpath = _get_sdcard_path()
        # Apparently this can both return primary (built-in) or
        # secondary (removable) external storage depending on the device,
        # therefore check that we got what we wanted:
        if not Environment.isExternalStorageRemovable(File(sdpath)):
            return sdpath
    if "EXTERNAL_STORAGE" in os.environ:
        return os.environ["EXTERNAL_STORAGE"]
    raise RuntimeError(
        "unexpectedly failed to determine " +
        "primary external storage path"
    )