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How to Fix an Undetectable USB Flash Drive?
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Currently there is no way to hook up a USB drive to the USB port on the AppleTV unit. That port is meant for "Servicing" according to Apple. While it would be nice to hook up an external drive, it is not supported.
Don't worry, Flash Drives are memory chips and are not affected by water. There are many cases of flash drives going through the wash and when dried, no information was lost. However, salt water will corrode the chip in a matter of minutes.
If your Flash Drive does get wet in the rain or in a water bowl, dry it off and gently tap and coax water out of the Flash Drive. Then let it sit over night to air dry. When you know it is dry, insert it in a USB port and view the program. If you get an error message, remove the drive immediately because it is not yet thoroughly dry.
Do not dry the Flash Drive in a microwave or conventional oven or use a hair dryer. The interior parts will melt.
To use the MP3 function, you need to store music file on folder. The folder will display on the monitor automatically when you connect UP3 to USB Port.