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answers:

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Which built in (if any) tool can I use to determine the allocation unit size of a certain NTFS partition ?

+5  A: 

fsutil fsinfo ntfsinfo [your drive]

William
A: 

use diskpart.exe . Once you are in diskpart select volume then when type filesystems It should tell you the file system type and the allocation unit size. It will also tell you the supported sizes etc... Previously mentioned fsutil does work, but answer isn't as clear and I couldn't find a syntax to get the same information for a junction point.

steven