>"Reading through the other comments - you have a very low chance to succeed, because if you want to swap controller boards then you need to move adaptive data

>"Reading through the other comments - you have a very low chance to succeed, because if you want to swap controller boards then you need to move adaptive data too, as other had said." I'm pretty decent with soldering iron and hot-air gun. Migrating the SMD flash/EEPROM chip shouldn't be too hard. >"But I'm curios what exactly happened, WD Green from 2012 are not the worst drives out there. How exactly they failed, what happens now when you power them on, with SATA connected, without? Did you try external USB2SATA converters/boxes?" The discs spin up but the controller no longer communicates with the host. The computer doesn't see that the drives are attached to the SATA bus. There were no signs of problems coming, they just suddenly stopped working from one power-up to the next. I tried with different motherboards and a couple of SATA-USB bridges, all same result.