Avoid forced boot-time disk check (fsck) with RHEL or CentOS 5

- Power on machine
- While GRUB is up, highlight the kernel that you would normally boot
- Press the "a" key to append additional parameters
- Type "fastboot" and press enter

The system will boot without performing the fsck disk check. To disable disk checks going forward, use the tune2fs command (ex. tune2fs -i 0 /dev/hda1)