Ejecting a USB from My Computer without unmounting them from My Computer may lead you to different issues. If you eject it before cached information is written or written, the chances are pretty higher that you may face corrupted file issues in the future. It may also affect the working, performance, and overall loading speed of your computer system and may cause you serious glitches. So, it is highly recommended to unmount the USBs from the My Computer before ejecting them. It will help USB clear the cache and the remaining data efficiently and further stop any processes going there in the background.