[root@localhost ~]# mount /dev/cdrom /mnt/cdrom/
mount: block device /dev/sr0 is write-protected, mounting read-only
虚拟机挂着光驱光驱时提示只读，用以下命令可解决该报错，
mount -o remount,rw /dev/cdrom /mnt/cdrom
参考网址：http://blog.chinaunix.net/uid-30645967-id-5701870.html