# 2.7.获取安装文件

安装时间会因所选发行版、安装介质和计算机速度而异。一系列信息可指示进度。

首先，安装程序会格式化所选的磁盘并初始化分区。接下来，在使用 `bootonly media`/`mini memstick` 的情况下，它会下载所选组件：

![显示下载不同组件的菜单](https://docs.freebsd.org/images/books/handbook/bsdinstall/bsdinstall-distfile-fetching.png)

**图 31. 获取分发文件**

接下来，会验证发行文件的完整性，确保它们在下载过程中没有损坏或在安装介质中读取错误：

![显示验证不同组件的菜单](https://docs.freebsd.org/images/books/handbook/bsdinstall/bsdinstall-distfile-verifying.png)

**图 32. 校验分发文件**

最后，经过校验的分发文件会被解压到磁盘上：

![显示提取不同组件的菜单](https://docs.freebsd.org/images/books/handbook/bsdinstall/bsdinstall-distfile-extracting.png)

**图 33. 提取发行文件**

在所有请求的发行文件解压完成后，bsdinstall 将显示首次安装后的配置界面。可用的后配置选项将在下一节中概述。


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