Tested for 2 weeks, with three USB devices (USB 1 and 2 32GB external drives a 2007 and a 2011) with two formatting options available (FAT32 and EXT3) and 2 USB ports available; Result: The terminal becomes unstable as soon as you connect a USB device. Read crash (any file locally or on network), recording; loss of recording schedules (recurring programming), in short the product is not over on that side. We can not rely on it to save.
No problem at the media center (tested HADOC Wifi network, Linux and MediaTomb) provided to disconnect the USB device.