I'm stuck at Mountain Lion 10.8.5 because I'm a Pro Tools TDM user and 10.3.10 is not supported in Mavericks or Yosemite. It's been pretty much rock solid, but I'm having trouble with a Seagate 4TB USB 3.0 drive (1JFAP1-500 4TB). The drive mounts, and reads ok, but writes to the drive either...