关于freeBSD的安装

我现在打算安装freeBSD5.2.1.(以前没安装过，只装过LINUX）
是在FTP上下载ISO文件刻录光盘安装的。请问5.2.1-RELEASE-i386-bootonly.iso这个文件是干什么的？我应该从哪张光盘安装起？

只要disk1就行了

I think the disc "5.2.1-RELEASE-i386-bootonly.iso" is used only for boot the FreeBSD installation process.After booted,you can install the FreeBSD box via network or harddisk.If you want to burn a disk for your installation media,you only need disc1.Bye the way, disc2 is used only for fix your system when it's crashed.