Jack Wallen walks you through the steps for enabling PXE boot for virtual machines in VirtualBox.

How to Boot from a Secondary Hard Drive. Businesses often require the use of dual-boot setups -- computers that can run more than one operating system -- to access certain applications or hardware.

Head over to VirtualBox Images, where you can download and run pre-compiled VDI files (i.e. VirtualBox hard drive images, like the dynamic/fixed kind you created above) for some swap-and-run fun.

When you start VirtualBox, you should see a screen like this. You don't need to change anything yet; just click the "New" button in the top left corner.