FreeNAS is a lightweight Linux distribution based on FreeBSD Linux that is good for a small server on your network (home or office). The size is pretty small (fit into USB disk) and its pretty easy to configure using built in web management console. This quick tutorial will show you how to install FreeNAS server.
Step by step to install FreeNAS Server
1. Boot your server using FreeNAS CD. You can download and burn the FreeNAS ISO from this link
2. Highlight the first option (Install/Upgrade) from the installation menu. Use keyboard up and down arrow to select between options.