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Persistent preallocation If an application needs to allocate disk space before actually using it, most file systems do so by writing 0s to the not-yet-used disk space.
持久性预分配如果一个应用程序需要在实际使用磁盘空间之前对它进行分配，大部分文件系统都是通过向未使用的磁盘空间写入0来实现分配。
The initrd is also useful as a non-persistent root file system mounted in a RAM disk for embedded Linux systems.
initrd对于在嵌入式系统中加载到RAM磁盘里的非持久性根文件系统来说也非常有用。
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