I seems Seagate's "tool" to check via serial # if a drive is affected or not, is a bit off (or, alternatively, is a piece of **** put out to buy time, depending on how you think about Seagate). People who tried serials from dead drives, sometimes get back the message that their drive is not affected.

I would seriously urge people not to trust this tool, but wait for more news (if that's even coming, that is).