I just recently bought a brand new harddrive (Seagate ST1000DM010). I tried to download some games from Steam and the Disk Usage hardly exceeds 300 KB/s, mostly being 0 B/s.
HD Tune:
http://imgur.com/O84EbIO.png (Benchmark, Read)
http://i.imgur.com/OCxefjd.png (Disk Monitor)...