SATA PCB Controller 006-0A90561 WD80EFAX WD80EZAZ WD100PURZ WD100EFAX WD80EMAZ
It's important to know when a PCB is bad and when swapping it with a donor PCB could work. A thorough diagnosis is required. Embedded in a Firmware on the PCB is "adaptive data" that is unique to the hard drive it's attached to.