Samsung UN46ES7500F E-Manual page 368

ΠAllShare Play supports only USB Mass
Storage Class (MSC) devices. MSC is a
Mass Storage Class Bulk-Only Transport
device. Examples of MSC are Thumb
drives, Flash Card Readers and USB HDD
(USB HUB are not supported). Devices
should be connected directly to the TV's
USB port.
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 them may not be
recognized. A USB device that requires
high power (more than 500mA or 5V)