Expanding Hard Drive Space and Create new RAID arrays

I currently have a 120GB HD that came with computer. I recently installed a new 250GB hard drive to expand my hard drive space. The questions is, can I mirror my current (120GB) hard drive onto the new 250GB drive, install a second 250GB drive, and then create a software RAID with the new drive set, thus creating a 500GB software raid with my the data contained on my old (120GB) hard drive?

Hi subterranean;
Welcome to the Apple Discussion Forums.
If you mirror a 120 GB drive and a 250 GB drive, the result will be equal to the smaller hence you would end up with a 120 GB mirror RAID array.
That doesn't sound to practical to me. Exactly what do you hope to gain here. It might help you to talk about end results rather then solutions. That way we can come up with solutions that will give you the results you are after.
Allan

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