Seagate, after hinting in May that it would release 8TB and 10TB hard drives in the next 12 months, has started delivering early samples of its 8TB hard drive to "major customers" (i.e. enterprise customers). Curiously, while Western Digital hit 6TB last year by filling its drives with helium, Seagate appears to be pushing the 3.5-inch spinning disk storage envelope by simply increasing areal density. Western Digital, incidentally, despite being the first to 6TB, hasn't announced anything new since November 2013. Maybe helium wasn't quite ready for prime time?