If you cannot move or write files on your server, then to change permissions on FreeNAS directories, it is necessary to …:-
ssh to freenas (using your freenas user name and password)
“su” (asks for root password)
“chown -R user:groupname folder_name” for changing user
and
“chmod -R xxx folder_name” for changing permission whrere xxx are permision for owner/group/other user (something like 770, 750 or whatever you need)
A useful exposition of setting up afp (Apple file protocol) on a FreeNAS server
Here is a good tutorial on assembling a NAS server using the Norco RPC-4020 case
http://www.avsforum.com/avs-vb/showthread.php?t=1110689
Here is a basic review of the case, and here is a retailer:-
http://www.newegg.com/product/product.aspx?item=n82e16811219021
Here is a similar product available in the UK
http://www.xcase.co.uk/X-Case-RM-420-Hotswap-4u-p/case-rm420.htm
A very thorough guide to building a 20 Terabyte NAS box, with comprehensive budgetting and testing data:-
http://www.tweaknews.net/reviews/20_terabyte_mega-nas_project/