I have installed Windows XP in VirtualBox and basic operating system is Ubuntu. In Windows XP, when I put any pendrive, it doesn't read that. How can I fix this problem so that the pendrive can also be read in Windows XP? Any command?
A virtual machine is just that, a virtual machine. It doesn't see your USB ports, it sees virtual USB ports. If your host allows it, you can enable USB passthrough to expose the USB pen drive to the virtual machine.