Is it possible to use both harddisk and cd-transport (usb) plugged in at the same time? Not playing at the same time, but connected to a6.
If you connect using a USB hub, you can connect and use an external HDD and CD player at the same time. Depending on the power situation, you may need to use a powered USB hub.
Most (if not all) USB drives will work without a power adapter if plugged into an USB3 socket (800mA). Mine does. The A6 can deliver max power on all ports concurrently.