RAID - z会经常检验数据校验和，以确认完整性，它还能够识别需要重新构建的块。
RAID-Z is constantly verifying data checksums for integrity and is able to identify blocks needing to be rebuilt.
在不稳定树中搜索时，第一步是重新计算页面上的校验和。
The first step in the unstable tree search is to recalculate the checksum over the page.
PLC每接收到一帧数据，对该帧数据进行异或校验，如果无误则存送到指定缓冲区，如果有误则请求重新发送。
When PLC receive one frame data, it checkout the frame. If the data is correct, it is saved in the appointed buffer. If not, PLC request the IPC resend it.
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