Samsung UN46ES7500F E-Manual page 136

If there is no music file on the USB device
N
or you don't select a folder containing a
music file, the Timer function does not
operate correctly.
If there is only one photo file in the USB,
N
the slide show will not play.
If a folder name is too long, the folder
N
cannot be selected.
Each USB you use is assigned its own
N
folder. When using more than one of the
same type of USB, make sure the folders
assigned to each USB have different
names.
We recommend that you use a USB
N