You can remove USB devices from the host if you need to shut down the host for maintenance or if you do not want a device to be available to virtual machines that run on the host. When you detach a USB device from the host, the device disconnects from the virtual machine.
Use caution when you remove USB devices from a host, for example, when you plan to do maintenance on the host. If data transfer is taking place, you can lose data. Also use caution when you stop or disconnect the USB arbitrator. When you disable the arbitrator, devices connected to the virtual machine become unavailable.