This article is from the storage FAQ part1, by Rodney D. Van Meter with numerous contributions by others.
I used to work for ASACA, which makes Metrum's (now Mountain Gate) robotics and makes a 12 MB/sec. magneto-optical disk drive, and resells AMASS in Japan. I now work at USC's Information Sciences Institute working on the Netstation project http://www.isi.edu/netstation/ (essentially, network-attached peripherals and high-speed networking). This information is included so you can identify my bias. Obviously the things that I know the most about are the best-represented. I attempt to be as impartial as possible; if you have complaints about my fairness, let me know. None of this should in any way be construed as the official opinions of ASACA, USC/ISI or Caltech, and may not even represent MY opinions.