Keeping in mind that the same OS (Lolipop) runs on MotoG which can be 8 GB, how can it be that OS takes up 8 GB? MotoX comes with only a couple of extra software, which surely cannot much space…
(Click image to enlarge)
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If this was my device, I'd perform a Factory Reset to see what the storage looks like after that. – DukeSilversJazz Sep 10 '15 at 14:10
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Give us the output (screenshots) of Diskinfo and DiskUsage. – Firelord♦ Sep 10 '15 at 14:21
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I have added the screenshots – Giannis Sep 10 '15 at 15:56
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So this would make sense if there are 3GB for system hidden from these apps – Giannis Sep 10 '15 at 15:57
Try to do a factory reset. If your memory is still such 'low' comparing it to the other models then it's just the way it is. Flashing the entire stock image may be a good thing to do since it may be firmware related.
I have Moto X 2014. Stock ROM. The storage you get is 24.98gb. Even if you factory reset it. You will still have the same.
