What is the strange alloy the control board is covered with? It is oxidised even on new disks. Why some disks have tinned control board, but other covered with this ugly alloy?
Thank You very much! That was interesting! So, that means, that WD (and other vendors) doesn’t mean the oxidation of silver plated contacts as a problem, and users continue to solve this problem with a simple soft eraser (as I do it).
Some days ago I tried to buy a new 2Tb WD Caviar Green WD20EADS. It had completely black contacts on PCB being inside a sealed package.