Raspberry pi NAS

Hello tek syndicate crew.
How would I go about making a NAS using a raspberry pi B+ and freeNAS(or some other OS). Detailed instructions please.

Just no.

A Pi has no where near enough RAM to support freeNAS. You might get away with running NAS4Free, but you might need to just run Rasbian and setup samba or cifs.

You might be better off getting a BananaPi (as it has a sata port) and has larger ram and a more recent ARM processor. 

PS. Jump over here on Overclock.net seeing as there is a very similar thread atm.