Hello, noob here and I got a raspberry pi to set up as a server/media centre using raspbmc. I put it all together, set up raspbmc, got a mains powered usb 7 port hub and connected my drives to it (1x2tb, 1x3tb, 1x320gb and 1x160gb). I added all the files of various qualities and file extensions and most worked fine, except 1080p x264 .mp4s, after hours and hours of googling, and trying every conceivable suggestion by many people I still failed to get it to work without buffering/stuttering. So out of desperation today I tried a flash usb memory stick to see if that worked (thought maybe a data transfer issue from the mechanical hdds), I transfered a file to the drive and put the drive in the hub, still buffered. Finally as a last ditch effort I put the flash drive directly into the raspberry pi, bypassing the hub, and the video played flawlessly, so I then tried the hdds directly, and again the videos worked flawlessly. There are 2 reasons for creating this post, firstly to try to help anyone who was experiencing the issue I was and secondly to ask if anyone has any advice as to if it is just an issue with the specific hub, and if anyone can suggest a hub that will work in the way I'm trying to use it.
Apologies if is seems like I'm rambling on I'm just trying to give as much detail as I can.