Source: Blog | Raspberry Pi
Enjoy!
Sorry, I an extreme novice in regards to a lot of this stuff. I might just not understand, but on the B+ are the USB and Ethernet bandwidth still tied together then?
I currently have my entire DVD/Blu-ray collection ripped onto a hard drive that's connected to a PC, but I don't like leaving the computer running all the time or dedicating system resources to media streaming. I was thinking about using the RPI with external HD to make a micro-NAS to create a media server for my home network. My biggest concern is that streaming high definition content that the connection would cannibalize itself and either the ethernet or USB would be affected by the shared bandwidth.
Or is the bandwidth great enough that I'm just over thinking it and it shouldn't be an issue.
Thanks in advance for the great answers and patience with a new-comer 
Sorry, I an extreme novice in regards to a lot of this stuff. I might just not understand, but on the B+ are the USB and Ethernet bandwidth still tied together then?
I currently have my entire DVD/Blu-ray collection ripped onto a hard drive that's connected to a PC, but I don't like leaving the computer running all the time or dedicating system resources to media streaming. I was thinking about using the RPI with external HD to make a micro-NAS to create a media server for my home network. My biggest concern is that streaming high definition content that the connection would cannibalize itself and either the ethernet or USB would be affected by the shared bandwidth.
Or is the bandwidth great enough that I'm just over thinking it and it shouldn't be an issue.
Thanks in advance for the great answers and patience with a new-comer
The Ethernet is still connected to the ARM via the USB 2.0 interface
the difference is the Ethernet chip now has a 4 port hub on it vs a 2 port, see included diagram
for full details see the PDF here: http://ww1.microchip.com/downloads/en/DeviceDoc/9514.pdf
So ultimately all data from the USB HUB connected devices and the Ethernet share the same USB2 upstream channel
