USB devices are greyed out in VirtualBox

I'm running Windows XP on Virtual Box. I'm trying to write to a USB pen drive. VirtualBox detect the pen drive but its name is greyed our in GUI. And I couldn't pick it from the list. How can I use this pen drive with the virtual machine?

USB device greyed out


Solution 1:

I found the solution myself. All I need was to eject usb pen drive from mac's desktop. When the drive ejected, it became available in VirtualBox.