Samsung UN55ES8000G E-Manual page 556

ΠMore than 3TB USB HDD is not
supported.
ΠIf more than 2 PTP devices are
connected, you can only use one at
a time.
ΠIf more than two MSC devices are
connected, some of the devices may
not be recognized.
ΠA USB device that requires high
power (more than 500mA or 5V)
may not be supported.