How is Free space for a Disk in the array calculated?

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I have an unraid array with 18tb drives. 

Each drive is listed as 17.9TB free. 

The same drive in windows once formatted shows free as 16.3TB.

So why do the drives in Unraid show so much free space? 

Is that the correct or should look at it in a different way?

All the drives in my array are formatted using XFS



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Disk manufacturers show sizes using the metric system. This is agreed by the industry.

Unfortunately Windows is the only OS not following this standard, which leads to a lot of confusion.

Apple and Linux distributions show sizes the expected (correct) way.


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