Samsung UE40D7000LU E-Manual page 242

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If more than 2 PTP devices are connected, you can only use one at a time.
● If more than two MSC devices are connected, some of them may not be
recognized. A USB device that requires high power (more than 500mA or 5V)
may not be supported.
● If an over-power warning message is displayed while you are connecting or
using a USB device, the device may not be recognized or may malfunction.
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