I would like to use my old 2006 Mac mini (4GB RAM, 2.0GHz Core 2 Duo CPU) for the purpose of running FreeNAS. The latest instructions I found say it is best to install FreeNAS on a small USB thumb drive since the OS will utilize the entire hard drive space. The 320GB internal HD will keep its OS X intact for now. I plan to use external storage for the NAS file sharing. Even with the current FreeNAS 9's minimum hardware requirements being higher than they once were, I believe this Mac will do fine to, at the least, properly evaluate if FreeNAS will be suitable for my media sharing needs. I do not expect it to be able to use RAID volumes with ZFS or run any fancy plugins. The testing setup will be very basic. I downloaded the FreeNAS .iso, burned it to CD, booted from the CD, and installed it to a 4GB USB thumb drive successfully. The Mac mini will not boot from the USB drive, though. Just to see if the installation was actually working, I connected it to my Windows 7 PC and it booted fine there. I also connected it to my 2012 Mac mini. It too sees the drive and boots fine. I have two other older minis (2009 and 2010 models) that will not boot from it either. I thought all Intel Macs would be able to boot from non-Mac partitions just fine as they do in support of BootCamp. What makes the 2012 mini model different from the previous models? The firmware obviously supports it. I know about rEFIt and rEFInd. I installed both and they did make identifying all the available partitions more obvious but did not make booting from the USB FreeNAS installation work. It just ends up booting to a DOS-like screen with an error message. I came upon a couple of instructions for booting unix/linux from a USB drive on a Mac, so perhaps this is what I need to do. FreeNAS is also available as an "image" file download. Here is what I found: (even though this is dated, I believe it still applies) http://alexcline.net/2011/02/25/installing-freenas-to-a-flash-drive-on-a-mac/ and then there is this which sounds like the same solution (I have not watched it all the way through) https://www.youtube.com/watch?v=ssNr33w8UrE So will I need to follow what is said here or is there a way to make the native FreeNAS .iso USB installation boot from the 2006 mini as is? Thanks.