CentOS 5.9基于红帽企业版RHEL 5.9。
官方发布说明：http://lists.centos.org/pipermail/centos-announce/2013-January/019205.html
BT下载地址：
CD：
http://mirror.centos.org/centos/5.9/isos/i386/CentOS-5.9-i386-bin-1to8.torrent
http://mirror.centos.org/centos/5.9/isos/x86_64/CentOS-5.9-x86_64-bin-1to9.torrent
DVD：
http://mirror.centos.org/centos/5.9/isos/i386/CentOS-5.9-i386-bin-DVD.torrent
http://mirror.centos.org/centos/5.9/isos/x86_64/CentOS-5.9-x86_64-bin-DVD.torrent
I368版：http://mirror.net.cen.ct.gov/centos/5.9/isos/i386/
X64版：http://mirror.net.cen.ct.gov/centos/5.9/isos/x86_64/
