You’re used to remove external devices being used regularly from USB ports through ‘Safely Remove Hardware‘ icon which is seen in system tray on the right side of the taskbar. Sometimes, even after doing so to eject USB devices, having been locked, causes trouble without ejecting and thus you can’t safely remove a USB drive.
To quickly and safely remove USB devices, USB Disk Ejector is available. Using this portable tool powered with shortcuts or hotkeys, with one mouse click you can safely eject the USB drive.