因为选择安装两个磁盘奇偶校验磁盘，所以有效存储大小将接近于其他三个磁盘的总和。
Because we chose a two disk parity setup, the effective storage size will be close to the total of the other three devices.
与其他的错误校验码类似，汉明码也利用了奇偶校验位的概念，通过在数据位后面增加一些比特，可以验证数据的有效性。
And other similar error checking code, Hamming code also makes use of the concept of parity, data bits followed by an increase in the number of bits, can verify the validity of data.
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