At this time, the WD TV product line does not support the use of single USB drives larger than 2 TB. Doing so may cause corruption to the data, or damage to the partition. Our dual and network drives larger than 2 TB’s can continue to be used with the WD TV products. WD is currently working on a remedy to this situation, and will notify our customers when it becomes available.
For further information, please refer to Knowledge Base Answer ID 5875.