Recover from stupid mistakes in /etc/fstab...
 

Use either of the below solutions.

  1. Boot from CentOS install DVD and choose Rescue System-option. Then browse to /mnt/sysimage to see the disk root and edit fstab etc-folder.
  2. See remount option on http://www.xssist.com/blog/Recover%20from%20mistakes%20in%20etc%20fstab%20or%20e2label%20usage.htm.