Clusters & NTFS Partition

I've a 2nd HD, and i can see that i can format it in NTFS with cluster 512 to 4096 ko.

To save my space, How can i install WindowsXP formatting my disk with clusters 512?

I found an answer (that i think easy but stupid):
install XP on my 2nd HD then format the first with cluster 512ko

Is there another answer?
 
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