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You can look in the /sys filesystem and power down the specific USB device (I do not remember the exact files you have to manipulate, and you have to dig for the specific device).
Or you, could try removing the kernel module managing usb storage, by typing
modprobe -r usb_storage
with administrator rights.
In all cases, it is much better you to unmount all filesystems in the device before deactivating it.
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