alphanumeric wrote:Correct me if I'm wrong, but isn't the Pi Zero the only Pi that works as a device via the OTG cable? My guess is it's something to do with that function. To make it easier to connect, setup, and use headless.
The A/A+ can be made to work in device mode, but it needs to be configured in the kernel as it hasn't got the OTG detect line on the standard USB port.
It can be booted via USB using the rpiboot code so the SD card will appear as a USB storage device, the same as the CM (essentially turning the Pi into an expensive USB card reader).