A warranty granted by a company may have certain restrictions; however each State in the U.S. in its common law and statutes provide certain restrictions and requirements for warranties as well (you will note that many warranties provide explicit distinctions for various states). Making a blanket statement that "rooting voids the warranty" may not be, and probably isn't true.
Despite what restrictions companies put on their warranties, different jurisdictions throughout the U.S. have different interpretations of those restrictions.
I believe that if you Root your NC and the USB port fails (physically), you will still be covered by the warranty. You would be wise to return you NC to a factory state. However, if that were an impossibility (ie. the battery wore out before you could perform the 8x reboot and factory reset) I think if you were forced to sue B&N to enforce the warranty if they tried to deny warrantying the device for the reason that the software had been modified by the end-user, most jurisdictions in the U.S. would hold B&N to warranty the physical device.
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