Samsung UN46ES7500FXZA E-Manual page 493

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 2TB USB HDD is not
supported.
ΠIf more than 2 PTP devices are
connected, you can only use one at