[X4U] Disk Utility

[DAN A CURRIE]

Hello,

On my kids MDD dualie 1.25 / 2 - GB RAM / 2 - 120 GB HDD + 1 - 3 GB HDD 
/ OS 10.5.4.

I would like to set the computer up so that I do not need to install the 
OS disk to run Disk Utilities.

EXACTLY what is the minimum I need to install on the 3GB HDD to allow it 
to be a startup disk?

Thank you,

Dan II