Samsung PL64E8000GFXZP - Manual (Page 449)

delete the file.
ΠIf the database of the saved file list
cannot be constructed because there
is no free space on the USB device,
you may not be able to view a new
file even if you have added the file to
the USB device.
Supported Devices
ΠCertain types of USB Digital camera
and audio devices may not be
compatible with this TV.