You can't reliably use anything over 2tb on XP -- and even some Vista and 7, depending on the exact hardware!
There are some tricks to make it "work", but not really.
Here a horror story: I was ripping my DVD collection to ISO, storing on HDD, using a Windows XP computer. When it hit 2tb, then disk lost the formatting. I returned the drive, thinking it was bad, and proceeded to go again. Yep, again, 2tb, it failed. I wasted a lot of time, and at least it was something that I could easily "recover" (redo).
Do you really want to take that risk?
It's about the hardware, it's not as a simple as using only 2tb worth. The hardware is fundamentally different, which is why 4tb can fit on those modern platters.
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