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How can I defragment disks in clusters that are much larger than 4KB?

How can I defragment disks in clusters that are much larger than 4K bytes? Is it impossible? Would I have to resize clusters to 4KB and then defrag? If so, how do I resize clusters on NTFS? Partition Magic doesn't work for this. What does?
If you are running Windows XP, the cluster size is not a limit any more. But under Windows 2000/NT4, you are bound to the 4KB cluster size limit in order to run a defrag job. As far as I know, Partition Magic 8.0 is able to change the cluster size. Also, previous versions of Partition Magic should work.
This was last published in December 2002

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