How do I copy all iTunes data from ext to ext disc

Question

Hi,
my RAID mirroring system had a defect. Now I bought a new 1000 GB disc (two discs seem to be safer than a RAID mirror system after all) and want to copy all my iTunes data (approx. 400 GB) from that RAID mirroring system to the new disc. How can I do that so that iTunes works on with the new copy? (Later I want to reconfigurate the 2 x 500 GB RAID mirroring system into one 1000 GB disc and use it as back-up). I've checked already:
1) "iTunes data to saving medium" (or whatever that option is called in the English version): it only saves to CD.
2) "iTunes data export" (or whatever that option is called in the English version): it creates an .xml dataset and probably is no solution for my copy problem.
3) Shall I just copy all iTunes data via FINDER to the new disc and then tell iTunes where to find the iTunes data? Or what else should I do?

Answer 1

Thanks again. That one runs on my keyboard under "alt" (alternate).
Maybe you know this one too.
Under "podcasts" at the RAID Mirroring system I found only some of my podcasts. iTunes seems to hold more than 50% of my podcasts on my local disc (under the folders Music / iTunes).
I know that iTunes acts peculiar when it doesn't find the path I specified (that happens when I forget to start the ext. disc before I start iTunes). It tries to build a new database on my local disc (That's the reason - as far as I assume - why more than 50% of my podcasts are on my local disc.) Is there any simple procedure how I can tell iTunes to copy these podcasts to the external disc or - provided I copy them myself - to tell iTunes: mix the two podcast-folders together.