*            文字列(<code>null</code>可)
     * @param defaultStr
     *            引数の文字列が<code>null</code>だったら返す文字列(<code>null</code>可)
     * @return 引数の文字列を返します。引数の文字列が<code>null</code>だったら<code>defaultStr</code>
     *         を返します。
     */
    public static String defaultString(final String str, final String defaultStr) {
        return str == null ? defaultStr : str;
    }

    /**

	errors map[int]error
	// The error to return when no error value is programmed
	defaultErr error
	// The current API call number
	callNR int
	// Data protection
	mu sync.Mutex
}

func newNaughtyDisk(d StorageAPI, errs map[int]error, defaultErr error) *naughtyDisk {
	return &naughtyDisk{disk: d, errors: errs, defaultErr: defaultErr}
}

func (d *naughtyDisk) String() string {
	return d.disk.String()
}

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