It's not really marketing junk -- different drive firmware does make a difference in NAS and RAID applications. I'd probably be looking only at 4TB Ultrastars to fill the ARC-8050, or SSDs. I might go with something lower end for an 1813+ since you're probably not buying a gig-e connected NAS for performance.
(it depends, though -- if you're doing just huge volumes of audio, you probably only care about reliability and sustained performance, and not much performance at that; and even flac doesn't use much disk space. it's video or other info which requires high-speed direct-attach drives in 20TB chunks.)
(it depends, though -- if you're doing just huge volumes of audio, you probably only care about reliability and sustained performance, and not much performance at that; and even flac doesn't use much disk space. it's video or other info which requires high-speed direct-attach drives in 20TB chunks.)