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PR4100 capacity question

I am looking to get one of these to replace two MyCloud devices. I followed an email link to the US site, where they sell PR4100 with capacity of 40TB (4x10TB).

But when I went to the UK site, it only shows 32TB versions, I am wondering why?

If I can buy the bare PR4100, I can also buy 4off 10TB Red drives, which WD sell. Again I am curious if this will work, given the above about UK and US version.

Yes it will work

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