Trusted Computing Base is an install-time option only and to enable TCB on an existing AIX machine, you need to reinstall the entire AIX operating system.

可信计算基础只是一个安装时选项，并且若要在现有的AIX计算机上启用TCB，您需要重新安装整个AIX操作系统。

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This directory holds critical system configuration files, so keeping a copy of it can speed up recovery if you need to reinstall your operating system.

该目录下含有关键系统配置，因此，如果您需要重新安装操作系统，保留它的副本可以加快恢复过程。

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You decided that it's time to reformat and reinstall your computer's operating system so that it will start fresh and fast.

你决定，它的时间重新格式化并重新安装您的电脑作业系统，使它将开始的新鲜和快速。

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