I am building a new new file server and need to get new hard disk drives. The setup and usage pattern is: Mini ITX based system (i.e. not an of the shelf NAS) Ubuntu 12.04 LTS. I can change this for something else if there is a good reason. Sofware Raid 1 (mirror, md tools) Most of the data is composed of large video files. However, there are also documents, pictures, etc Server is always on. However, it is idle for most of the time. Replacing a server composed of WD Greens. Reliability is more important than performance. Streaming capability of two concurrent 1080p h264 streams is enough. Data is accessed over lan (smb) (media players, computers, etc) I am not sure if WD reds or WD AV-GPs are necessary or even desirable. For example, from my research I think that if i get the Reds I would have to disable TLER. Any Insights? Thanks.