Samsung UN60ES7150F E-Manual page 499

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.
ΠIf the TV has no input during the
time set in Auto Protection Time, the