I have spent the last week fighting with the NAS recording feature build into my camera DS-2CD2112-I. I have read every post and article that I can find about this issue and still can not find a solution.
My set up consists of a CubieBoard (https://www.miniand.com/products/Cubieboard%20Developer%20Board) running debian. I followed these instructions to setup the NFS server (https://help.ubuntu.com/community/SettingUpNFSHowTo) The drive is mountable on any of my home machines (windows, OSX and Linux) as well as it is recognized by the camera. The drive displays as "1.56GB 0.00GB Uninitialized NAS R/W" under the storage management. I have tried various drives ranging from 2gb to 1tb but all display as 1.56gb. When I format the drive it instantly goes to complete and remains uninitialized. Any input from anyone with experience is greatly appreciated.