IQaudIO PI-DAC+ - Using Rpi2 and External USB Devices

16)
Using RPi2 and external USB devices
Note that if you want to enable 1.2AMP USB support (to allow USB hard disks to power up when the
Pi-DAC+ / AMP+ is in use) then you may also want to add the following line to your /boot/config.txt
file:
max_usb_current=1
Please ensure your Pi power supply is able to deliver ~2amp if you are powering via mini USB and
enable max_usb_current
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