即便恢复大量数据所需的时间很短，也要验证校验和能否与原始数据匹配。
If it takes a very short time to recover even for an enormous amount data, you then verify if the checksums can match the original data.
CRC编码是把原始数据输入到校验公式中，生成校验码，然后组成新的数据。
CRC coding is that original data is inputted in checkout formula to create checkout code, then, composes new data.
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