Fritz! Fon WLAN 7390 Installation, Configuration And Operation page 67

Tips for Using USB Devices
•
To avoid damage to the FRITZ!Box, only operate USB
storage devices that require more than one USB port
for operation (for instance hard drives with a Y cable)
if they have their own power supply or a USB hub
with its own power supply.
•
The FRITZ!Box can not defend the USB memory from
external influences. Thus such phenomena as volt-
age spikes during storms may occur, and writing to
older USB memory devices may corrupt the data
structure due to a high number of defective struc-
tures. In such cases a complete loss of data may oc-
cur.
Therefore we recommend always making a security
copy of the USB memory content so that your data
are not irretrievably lost just because losses may oc-
cur on the USB storage device.
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