StorageReview.com have recently reviewed the WD Black 4TB Desktop Hard Drive, here's what they had to say about it...
The WD Black 4TB desktop hard drive is the latest high-capacity, high-performance drive from WD. The 4TB Black isn't entirely new of course, WD has been shipping a drive in this configuration for over a year. The prior 4TB model, WD4001FAEX, was a big step up at the time as it doubled the capacity of the 2TB Caviar Black and topped throughput by 12%. This time around, the WD4003FZEX doesn't get WD any higher capacity, but it does boast some aggressive performance claims. WD figures performance gains of anywhere between 26%-48% depending on the capacity thanks to an improved dual-core processor and other controller and firmware improvements.
Read the full review here