27 Mar
2007
27 Mar
'07
2:33 a.m.
If it's saying "Buffer I/O error on device hd*a*", then this is Linux speaking, not GRUB. If Trustix works and CentOS does not, that means there is probably either a bugfix in a newer version of Linux, or a regression, depending on which OS has a more recent version of Linux.
Try copying the kernel and modules from Trustix to the CentOS/Ubuntu system and see if it will boot. (assuming they're both similar versions; eg, both 2.6)