Most of the time people do not worry about safely ejecting USB from computer. And this can be ok for one, two or even hundred times. But then suddenly device stop working. That happens because when any device is plugged in it is powered with electricity and every time you break the electric circle you cause damage. To avoid this you need simply Safely remove hardware. There are three easy ways to do this:

1. Click on the arrow button is the system tray

Click Safely Remove Hardware

Click on the device you want to remove.

2. Open My computer

Select device you want to remove

Click Eject this disk in the System tasks panel

3. Turn off PC. Remove the device.

That's all. follow this simple instructions and your removable media will work for a long time.