Noticed a weird problem trying to install Windows as a virtual using VBox. The install kept failing as it was expanding Windows files, somewhere between 40% and 70%, and resulted in an “aborted” status within VBox.
Installing from a .dmg or .iso worked fine, it was just the optical drive, and the log pointed at a USB issue. The optical drive in my MacBook Pro was technically classed as a USB device, and VBox doesn’t like installing from a USB device. So converting the discs to .isos solved the problem. Also this isn’t a problem using my desktop, which has SATA optical drives, not USB.