@danwa, here is the info that was in that blog. It really wasn’t much, which makes this thread even better:
What do we recommend?
We’ve had excellent success with portable USB powered hard drives from Seagate (especially the Backup Plus line) and the Western Digital (Elements line only). WARNING - We don’t reccomend the Seagate powered 3.5" drives as they can report the wrong sector size or the Western Digital MyPassport line due to frequent USB disconnects.