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Defraggler crashes when analyzing drive with 128k cluster size

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From a quick search I did:
Up to a certain version of Windows 10 it only supported up to 64K cluster size (like several previous versions of Windows did). At some point Microsoft included 128K and above in Windows 10.

Since Microsoft changed a standard it will take disk based tools like defrag tools, recovery tools, etc., time to catch up to the change - if they bother at all.

As you've found out Defraggler doesn't support larger than the old/legacy standard of 64K, and the same issue will be present in most third party disk tools. Therefore you'll likely be limited to only using the Microsoft defrag tool already built into Windows, or if you can find some commercial defrag tool to purchase that supports it.

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