Powered USB Hub question

[Dragon12]

Thank you for reading this.

I bought an El Cheepo Chinese powered USB hub some time ago and while it works perfectly it feeds 5 volts back to the host device. I haven't it used it with my Raspberry Pi because the two 5 volt power supplies will be in parellel. I was going to perform some surgury on the cable (the case is sealed) and cut the 5 volt line to the host until I read something recently that indicated that this is how powered USB hubs are normally wired but Iḿ not so sure. What do you think about this?

[klricks]

USB hubs are not supposed to 'back feed' 5V per the specification however many do not follow the spec.

It used to be a big issue here but changes to the RPi B+ onward such as having 4 ports instead of 2, and improvements to the on board power circuits, have made the need for a HUB rare for most users.

[Dragon12]

I need to use a powered USB hub so that I can use my external HD drive and a USB optical drive. At this stage I cannot see an alternative.