I found the answer! If you have a Dell computer, the Dell Support Assist program keeps a lock on the USB drive, not allowing you to safely remove it. DSAservice.exe is the main executable file for the Dell SupportAssist service. The DSAservice.exe process continuously monitors the system's hardware and software components, checking for updates, performing diagnostics, and providing notifications to the user regarding any potential issues or available updates for their Dell system. Once you terminate the program in Task Manager and Disable or Manual it in Services, you'll be able to safely eject your USB again without any more disruption. If you do not have a Dell computer, you can use a small utility called "USB Safely Remove" to not...