I recently upgraded my 3G mobile broadband dongle to a newer model. Ubuntu recognizes it and I can connect/disconnect with no trouble. The problem comes when I try to safely remove the drive by right clicking its icon and choosing "Safely remove drive". When I do this I get a popup that displays the following

Unable to stop drive



Error detaching: helper exited with exit code 1: Detaching device /dev/sdc

USB device: /sys/devices/pci0000:00/0000:00:04.1/usb2/2-4)

SYNCHRONIZE CACHE: FAILED: No such file or directory

(Continuing despite SYNCHRONIZE CACHE failure.)

STOP UNIT: FAILED: No such file or directory

I don't really know what to do from here so I generally shutdown then remove the dongle as I do not want to damage it. Is this a common problem? Am I safe to just pull the dongle out after this message. The message is not particularly informative so I am not sure how best to proceed. I never had this problem with the previous model. Any advice would be very much appreciated. The model is identified as HUAWEI TD CARD storage