CentOS - Aug 2010 - Unable to mount devices in rescue mode

Booting to CentOS 5.5 works and I am able to login with all my devices 
mounted. When I boot from the install DVD and type "linux rescue" I 
eventually get the message, after attempting to have one of the screens 
mount my partitions in read/write mode:

"An error occurred trying to mount some or all of your system. Some of 
it may be mounted under /mnt/sysimage."

But nothing appears mounted under /mnt/sysimage. Does anybody have any 
idea of why this error is happening ? Should I try mounting my CentOS 
5.5 partitions manually at this point ?

Hi Edward.
(2010/08/02 2:29), Edward Diener wrote:
> Booting to CentOS 5.5 works and I am able to login with all my devices
> mounted.
snip
> But nothing appears mounted under /mnt/sysimage. Does anybody have any
> idea of why this error is happening ? 
Because your system has a driver to understand sysimage.
Install DVD only have major drivers.
If you have driver disk, Try this command with booting install DVD.
   boot: linux rescue dd
>Should I try mounting my CentOS
> 5.5 partitions manually at this point ?
If you don't have driver disk, boot with other live CD(Fedora, Ubuntu)
may include latest raid/disk driver can find your sysimage.

-Tsuyoshi.