Just an update: Although there has been a refutal recently, http://www.enterprisestorageforum.com/storage-hardware/selecting-a-disk-drive-how-not-to-do-research-1.html, I have been monitoring several tech sites and they do not agree with the refutal. Most, if not all of the users out there have experienced pretty much the same results as previously presented by the BackBlaze people -essentially, Hitachi is very good, then WD, and Seagates have some issues that need to be addressed. As in some people stating they have a failure rate approaching 25 percent over a short period of time.