If you mean 7200.11/ES.2/Diamondmax22 series it will not work. Connect only pcb without hda to pc and recognize it in bios or any other software. there will be capacity 0mb but serial number should be visible. What is that mean? It means that individual for any single hdd data are stored on its own pcb. Unless you do some work (sorry i cant tell you in simple words how exactly you need to do) it will not work. Use your brain/google/help someone and consider do you really have experience and proper tools to do that. @edit: as I underestand you mean swap pcb from another hdd right? Or by swapping you mean removing its own and put back together due all above steps in solution. avico, Sorry I was not clear at all. I will try again. I have two drives ST31000340AS, lets call them A + B. A is good and updated to firmware SD1A. B has SD15 but cannot be seen in BIOS, hd light is constantly on. Can I take pcb from B put it on A, flash the drive to SD1A, then put the pcb back to B. Will this work without damage to both hardware and data?