So from the screen that appears after you've selected the amount of RAM, click 'Create a virtual hard drive.' Choose VDI (VirtualBox Disk Image) as the file type.

In order to install Windows 10, you'll have to create a virtual hard drive for installing it. So unless you know what you're doing and have a very good reason to change it, accept the recommendation. You can change it if you want, but I've used VirtualBox for several years and have created many virtual machines, and I've found its recommendations to be on target. You'll be shown a recommended amount of RAM. On the other hand, if you need a fully-packaged solution with good support, VirtualBox might be too tricky.Next you'll be prompted to select how much RAM you want to devote to your Windows 10 virtual machine. If you're highly technical and capable of using online resources to troubleshoot and configure your own software, then VirtualBox could work for you. If you run into a conflict, you'll be stuck trying to sort it out on your own. That doesn't exist with open-source products. When this happens with a product that you're paying for, you have access to a lot of hands-on technical support. Lack of active support: Virtualization software is complicated and can easily have things go wrong with it. For instance, using VMWare or Parallels, you can drag and drop files from one system to the other. Operating system integration: The paid virtualization solutions have much better integration between the host system and the guest operating system. VirtualBox is no exception, and there is ample documentation available to anyone who needs help with their VirtualBox setup. Lots of info: One of the typical advantages of open-source software is that the user community creates a wide range of help and technical documents to assist people in the software's operation. You can then run most versions of Windows, DOS, Linux, or Solaris as a virtual system. This allows you to take advantage of open-source virtualization whether your platform is Mac, Windows, Linux, or Solaris. Range of supported systems: VirtualBox is available on all the major operating systems. If you're not happy with the virtualization options available to you in the paid software marketplace, then exploring VirtualBox might be for you. VirtualBox is a professional-grade, open-source virtualization software.

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