Grub2 setup question

[Madison Kelly]

Hi all,

   So I'm back to square one in my understanding of grub with v2. I'm 
hoping someone can help me out and/or point me to a decent tutorial on 
the new system.

   I've picked up an eSATA drive that I've installed CentOS5 on. I did 
this with my main Ubuntu 9.10 hard drive unplugged just to be sure that 
I didn't accidentally muck it up. So now I am finished the install and 
back under Ubuntu.

   I've trying to sort out how to add the CentOS install to my Ubuntu's 
grub. I dare not randomly try things as I normally would, given the 
potential of an unbootable system.

  So, given:

/dev/sda (hd0,x) = Ubuntu
/dev/sdb (hd1,x) = CentOS

   What is the safe way of setting up grub with an option to boot off 
the second drive?

Thanks!

Madi
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