To the best of my knowledge:
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No
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Yes (no)
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Yes, but we don’t have any 4k native drives for comparison
The thing is that there are still a lot of people not on Windows 8. If someone were to come out with a 4k native drive their market is solely Win 8 and Win Server 2003. So maybe in a couple of years when we have the majority on OS’s Win 8 or newer we’ll start seeing 4k native drives.