当磁盘启动或关闭时都会触发此事件。
This event is triggered when a disk comes up or goes down respectively.
如果你决定复制，那么在项目打开或关闭时都可进行。
If you decide to copy instead, then this may be done while the project is open or closed.
应用程序通常需要在它启动或关闭时执行工作。
A typical application needs to perform tasks when it starts up and shuts down.
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