Samsung PN51F4500AFXZA E-Manual page 77

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If there is no music file on the USB device 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, the Slide Show will not play,
A folder with a name that is too long cannot be selected,
Each USB device you use is assigned its own folder, When using more
than one of the same type of USB device, make sure the folders assigned
to each USB device have different names,
We recommend that you use a USB memory stick or a multi card reader
when using On Timer,
The On Timer function may not work with USB devices that have a built-
in battery, MP3 players, or PMPs made by some manufacturers because
these devices take a long time to be recognized,
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