Hard Drive Reliability
Google Labs has released a very interesting report, Failure Trends in a Large Disk Drive Population. This report is based on Google’s own internal study of the reliability of their own massive hard drive farm.
Carnegie Mellon University has also released a similar study, Disk Failures In The Real World.
References:
http://labs.google.com/papers/disk_failures.pdf
http://www.cs.cmu.edu/~bianca/fast07.pdf
http://www.grc.com/sn/notes-081.htm