Best answer: Not sure what you mean by "occupied." Yes there is a separate drive in each bay. You can't use both drives separately, however. So if you buy it with 8TB of storage that means each bay contains a 4TB drive but technically you can only save up to 4TB of data. One drive you are saving to but the other drive is used as an automatic backup of the first drive. While you can't take advantage of the full 8TB of storage space, you are making a duplicate of your first drive in case one drive crashes. That's the purpose of this product.
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