:Not being able to start your c7host due to Kernel Panic or some sort of "catastrophic disk failure" is not as easy to fix. You might be able to boot from your Centos LIVE DVD, open a terminal and mount the partition via command line and look for possible problems (setup files like /etc/fstab). Lab5 will discuss more about mounting and the /etc/fstab file. The "worst-case scenario" would be to purchase a new hard disk, perform lab1 completely, perform lab2 to install and set-up virtualization software, then restore your VM image and xml file backups (eg. decompressing images, issuing virsh define commands for xml files). That is why consistently performing backups of ALL of your VMS at the end of each lab is absolutely essential! You have been warned!