[CentOS] How NOT to have a disk recognized by grub?

Fri May 20 17:01:03 UTC 2005
Michael <addymin at pacbell.net>

Greetings:

I'm upgrading a fileserver running 3.4 (upgrade to a larger disk).  I 
backed up the data from the "old" disk and slapped in a newer, larger 
disk and installed Centos-3.4.  No problems.

Now, there are some files on the "old" disk that I forgot to move to the 
back-up disk, so I'd like to mount the "old" disk as /dev/hdd and reboot 
the system and transfer the files [hdd (old disk) --> hda (new disk)].

However, the old disk still has Grub on the MBR and when I boot, the 
system tries to mount the "/boot" and "/" partitions from BOTH disks!  I 
get errors about duplicate partitions and that those dups won't get 
mounted.The fileserver does boot but with a configuration combination of 
both systems.

Question: Grub is correctly installed and configured on hda.  How do I 
get the boot process to ignore the old disk (and MBR) on hdd???

I tried google but I can't seem to find this fix.

Thanks,

Michael Chinn