New Western Digital Hard Drive Controller Board 4061-705094-004 Rev 04P for WD My Book Essential / Elements 1TB, 2TB, 3TB, 4TB, 5TB USB 3.0 New Original Authentic Western Digital controller board Best Pricing on Amazon! Ships in bulk packaging 100% Satisfaction Guarantee - if you are not happy with this product return within thirty (30) days of the purchase date for a full refund.