I have two WD Black 500GB hard drives for sale. Both work perfectly and have a clean SMART report.
I was using the two drives in raid 0 (1TB total) for video editing in premiere pro. They could also be used in raid for a Steam library to reduce game loading times.
Just to clarify... I have two drives for sale, $40/each, or $70 for the both of them. They are identical drives.