Problem Ejecting Usb Mass Storage Device. The whole point of external USB-connected storage is that you can easily unplug it, but Windows's Eject Mass Storage option balks sometimes. If you cannot safely remove (eject) your USB flash drive or external hard drive then you will get the following notification message: "Problem Ejecting USB Mass Storage Device".
Problem Ejecting USB Mass Storage Device FAQ. But the bad thing is the issue of "problem ejecting USB mass storage device because this device is currently in use" does not allow you to translate NTFS may prevent the safe extraction of an object. Later, when the user signals that the device should be ejected, OS X, again quite nicely, sends PREVENT/ALLOW.
You can refer to this article, which presents several fleshed-out solutions.
However, USB drive is still irreplaceable for both work and daily life, and we have to face some annoying issues, like problem ejecting USB mass storage device.
Windows can't stop your 'Generic volume' device because a program is still using it. If you unplug a USB external drive before making sure it's safe to do so, you're courting disaster. The whole point of external USB-connected storage is that you can easily unplug it, but Windows's Eject Mass Storage option balks sometimes.