The MINIX 3 Operating System is a new open-source operating system designed to be highly reliable, flexible, and secure. To run MINIX 3, you need a PC driven by a 386, 486, or Pentium CPU or compatible. The standard configuration requires 16 MB of RAM. An 8-MB version is also available, but it is slower due to a smaller buffer cache. Since the distribution comes on a live CD, you can test it without allocating any hard disk space, but for a hard disk installation, 50 MB is needed as a minimum, 600 MB minimum if you want all the sources. The current version of MINIX 3 (3.3.1) is a work in progress. It is nowhere near as mature as FreeBSD or Linux right now (via)