That means that the software inside a virtual machine can’t escape and tamper with your computer. It runs a lot like any other program, but the virtual machine is separate from the rest of the system.

It’s like you’re creating a computer within your computer. So what is a virtual machine? It’s a computer file (often referred to as an image) that behaves like an actual computer. If you have a favorite, let people know about it in the comments below! I’ve heard that Parallels Desktop is amazing and wildly faster that VirtualBox, but I haven’t actually tried it myself. If it’s speed and graphics that you’re after, you might want to check out a paid version. There are, of course, some details like 3D graphics that might not be as good on VirtualBox as they might be on something you pay for. VirtualBoxĪlthough there are a number of popular VM programs out there, VirtualBox is completely free, open-source, and awesome. There’s no need for constant backups and restores. If something goes wrong, whether with software installations or by infecting your system with a virus, you can easily switch back to a previous snapshot. This lets you experiment freely with your environment. You can, at any point, save the state of your machine with a “snapshot” and revert back to that state if you need to. Because you can configure your virtual hardware, you can even install an old OS like DOS or OS/2. You can run software written for one OS on another without needing to reboot. The ambiguity of that last statement is I did that awhile before writing this comment and I don’t recall what I booted into first, only that it worked and was not hard to figure out what to do at that point.Virtual machines allow you to run more than one OS at a time. Installation will continue, or you will boot into the OS or get the Recovery Utilities menu (where macOS can be reinstalled from or Disk Utilities run). If the recovery partition isn’t present and valid, these instructions won’t work.Ĭlick the 2nd entry, you should see (and then click):

If the 2nd partition isn’t the recovery partition, look under the paths in the list to see if one of them is it. The second PCI path is probably to the recovery partition, the one you need to boot from. The first PCI path in the list is probably the boot partition that doesn’t contain bootable firmware. You should see two entries in a list (they are cryptic looking PCI bus paths). Select Boot Maintenance Manager and click. You’ll be brought into an EFI text-mode GUI. I was able to fix the UEFI problems as follows ( credit to techrechard website):

Running mac os on virtualbox