NTFS allocation unit size?

I've become curious after leaving this at default so many times... What does the NTFS "Allocation Unit Size" setting do, when you're formatting an NTFS volume?

I'm formatting a partition on a 4-drive RAID-0 with 64KB block size. Is there any advantage to setting the NTFS "allocation unit size" setting to anything in particular, as opposed to leaving it at default? Should I set it to 64KB maybe? Does this setting make a difference in raid?
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  1. Not really. I read a review where some geezer did a test on it. Didn't seem to matter what he used. Default should be fine. I always figured you might as well set the cluster size to equal stripe size but in reality it makes bugger all difference.

    <A HREF="http://www.anandtech.com/myanandtech.html?member=114979" target="_new">My PCs</A> :cool:
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