I have installed Raspbian and have attached 2TB External Hard Disk via USB with ext4 partition. I am trying to use it as a NAS device. Also I am accessing Pi over SSH from LAN and also from Internet. When I am accessing over Internet it gets disconnected randomly, lights on the board keep on blinking. It is not shown in connected devices list on my router Netgear (wnr2000v3). I am not able to figure out what is going wrong.
First I had connected via Ethernet and I have also tried using WiFi card but the case is same.