The problem seems to be, that the only method available for SATA drives is just not effective - despite re-flashing the firmware on the drive controller. The manufacturer's diagnostic program is better at taking control of the drive geometry and nuking all sectors that are marked as bad, as they actually have to have damage for the program to ignore them. This defeats the malware's obfuscation technique - That's my theory, and I'm sticking to it!

I've had so much success in using this, that it is hard to believe anything else is possible. I don't know how many drives I've saved that folks had written off, and were ready to throw in the trash. One of my clients, who's drive's SMART and diagnostic, reported imminent failure(fixed), is still in use today after three years of operation - malware free; I might add, as they listen to me now on security practices and solutions.
Sorry it took so long to answer - it seems TR is having alert problems, and I just now got mine.