Removable USB Drive - The Device is currently in use.

I'm trying to use a USB Hard Drive (Western Digital) attached to the host computer.

When I go to vm - > removable devices -> Western Digital External HDD - > connect

It says, unsuccessful and that the device is currenty in use. I don't have it mapped to a drive letter on the host machine. Also I tried the eject hard ware on the host machine, but I still get that message.

Any ideas how I can get it to work?

Thanks. Using Workstation 7.1