'How to command --block-size=512 and -b together in unix?

I am studying Unix at school now, and I am stuck on a question here.

I am trying to figure out what is the cluster count allocation when cluster size is 512 , 1024, 4096 in bytes.

so i tried to use "du --block-size=512 and -b " together, but it never worked together(I treid in many different ways)

How can i command it to get cluster count in bytes??

Also, I need to figure out what's the internal fragmentation and what is unused numbers of bytes.

Can anyone teach me how to do it? I am using Cygwin

Thanks!

du -b --block-size=512

expected to see roughly numbers of 18,294,470.5

unix cygwin

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