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From: Malcolm <malcolm@invalid>
Newsgroups: comp.sys.mac.system
Date: Mon, 24 Sep 2018 21:03:07 -0400
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Subject: Re: [NEWS] macOS Mojave Boot Camp issues on 2012 27" iMac
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Xref: csiph.com comp.sys.mac.system:118350

It's probable because Windows needs different drivers and partition map 
for drives bigger than 2.2 TB.  Above 2,2 TB, 32 bits is not enough to 
address all the disk blocks,

<https://support.microsoft.com/en-us/help/2581408/windows-support-for-hard-disks-that-are-larger-than-2-tb>