RAID 1 - DiskUtility will not allow me to use Macintosh HD as a slice.

Hi All,
I have a fully functional Mac Mini with the 80gig HD, I have been using it for about a year and just love it (Windows convert). I have just purchased a 160gig Lacie Brick and have decided to partition it into two 80gig partitions and use one of those partitions as a slice for a RAID 1 configuration. So basically I want to mirror my internal 80 and my external 80. When I go to DiskUtility, and attempt to create my RAID, it does not allow me drag the "Macintosh HD" to be a slice in the array. Is this because it is the boot partition? This drive is one single partition, at least from the untrained eye, I am sure there is a boot partition somewhere on it. Is this something I can even setup? DiskUtility allows me to drag the external 80 to the RAID but not the internal 80.
Any help or guidance would be appreciated.
Thanks,
Dave
Mac Mini 1.42   Mac OS X (10.4.2)  
Mac Mini 1.42   Mac OS X (10.4.2)  

I have a fully functional Mac Mini with the 80gig HD,
I have been using it for about a year and just love
it (Windows convert). I have just purchased a 160gig
Lacie Brick and have decided to partition it into two
80gig partitions and use one of those partitions as a
slice for a RAID 1 configuration. So basically I
want to mirror my internal 80 and my external 80.
When I go to DiskUtility, and attempt to create my
RAID, it does not allow me drag the "Macintosh HD"
to be a slice in the array. Is this because it is
the boot partition? This drive is one single
partition, at least from the untrained eye, I am
sure there is a boot partition somewhere on it. Is
this something I can even setup? DiskUtility allows
me to drag the external 80 to the RAID but not the
internal 80.
Any help or guidance would be appreciated.  
Don't think this is possible in a RAID configuration, since your external drive is not connected to the mini in the same manner as your internal. Normally RAID systems use the same type of controllers. If you want to backup your internal drive, try setting up a cron job that copies your data some time in the early morning...

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