Safely remove USB device
If you remove the USB device without properly ending services on the USB drive, it can corrupt the USB device if windows is using a file in the background .
Before removing the device, do the following
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On the notification area that is on the Taskbar, Click the Safely Remove Hardware and Eject Media
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On the menu, select the device you want to remove (your list will be different)
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When Windows is done ejecting the device, you will get a message that it is safe to remove