Samsung PN51D490A1DXZA - Manual (Page 118)

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English
● Each USB you use is assigned its own folder. When using more than one
of the same type of USB, make sure the folders assigned to each USB
have different names.
● It is recommended that you use a USB memory stick and a multi card
reader when using
On Timer . The On Timer function may not work
with USB devices with a built-in battery, MP3 players, or PMPs made
by some manufacturers because these devices take a long time to be
recognized.