If you unplug USB drive without dealing with the error message, partition on the USB drive may be corrupted and files are not accessible. When you encounter this error, do not force to remove USB drive. Close any programs using this device and then remove it. Don't remove this device while it is still in use. Windows is unable to stop the device 'USB Attached SCSI (UAS) Mass Storage Device'.The device 'Generic volume' cannot be stopped right now.Close any program or windows that might be using the device, and then try again later. Windows can't stop your 'Generic volume' device because it is in use.Close any programs or windows that might be using the device and then try again. The error message will be different on different systems: The 'problem ejecting USB mass storage device' issue occurs to USB drives (USB flash drive, external hard drive, thumb drive, pen drive, etc.) on Windows computer when you click the 'Safely remove the hardware' icon at the right-bottom corner. USB mass storage devices are useful tool to store or transfer bulky data between computers. Method 4: Eject USB drive using free partition manager Method 3: Remove USB mass storage device in Disk Management Method 2: Eject USB drive in Device Manager ���Method 1: Safely unplug a removable device How to fix 'Problem ejecting USB mass storage device'? Symptom of 'Problem ejecting USB mass storage device'
