That disk might be too power hungry for a Pi, whether it is a B or B+. You will have to give it a separate powersupply. And then you can use a B or a B+ B+ advantage here will be the extra USB ports. A 500 mA power supply for a RPi is too weak anyway. That is correct the WD Red has a peak of 5.4W s...

Hi all, I have searched online quite a bit but not really found an answer that has proved sufficient. So I bought a Raspberry pi B+, with plans to add an 3.5" Western Digital Red (as a backup solution). I have read that one should by the model B+ so one can unlock the extra power needed for external...