thx for your answers.
What do you mean with "align your array"? I just created and NTFS Partition ...
Sorry but I don't get the point. Actually I don't see any difference to a single disk. I would see the same corruption issue with a single disk.
For raid 0 or 1, you don't really care of the answer...but it really does matter for raid 5 or 6
I needed 2 extra Sata Ports, but without that, I could have used XPs SoftRaid, couldn't I. So I feel a little fooled.
BTW I used 128K blocks on the array. I know what this blocksize matters on filesystem level, but I am not sure what this matters on that lvl.