Samsung PN51E6500EFXZA - Manual (Page 497)

ΠAllShare Play supports only USB
Mass Storage Class (MSC) devices.
MSC is a Mass Storage Class Bulk-
Only Transport device. Examples of
MSC include 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.