Answer: YES. You can. I tried it, it works. Idles at 1.80amps, takes about 2.2 amps surge to spin up the drive. There is a catch. You must have the battery cover removed. Why? the 9v isnt connected to the circuit at all until the saftey interlock is disengaged. The interlock switches out the 6V battery and switches in the 9V battery when the cover is slid off and removed.
Is it advisable? no. Why? it runs the switching regulators harder/hotter. Heat shortens the lifetime of components in the long run.
