BMW 2009 328 Owner's Manual page 166

vided that this is supported by the audio
device. Therefore, do not connect the USB
audio device to the power socket in the
vehicle during operation.
> Do not forcibly connect the plug to the USB
interface.
> Do not connect devices such as fans or
lamps to the USB-audio interface.
> Do not connect USB hard disks.
> Do not use the USB-audio interface to
charge external devices.
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