Ah, this is nice, perhaps this will push down prices on 4Tb drives after a while. And it sounds like it does not use helium. Just a standard drive.
coolcolors, why switch, keep and just buy new ones when you need, no need to get rid of the old drives. The more space the better, all though to many drive can be a burden.
Who burns dvds or blurays in this day and age, that is only for backup or things you absolutely want to keep on optical media, the rest is saved on harddrive. At least none important data. Cheap, reliable especial if you use them in a docking station, and do not have them plugged in or in use when you do not need to. Plus you can access all data on drive instantly.
I guess the next best thing for storage are LTO Ultrium tapes. And after that optical like cd, dvds and bluray.
Nice that 6Tb is coming soon to us, and at great prices. For now though 4Tb is good enough.