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How to set up a new virtual machine in Virtualbox

Oracle's Virtualbox is one of the more popular tools to set up and interact with virtual machines, not least because it's completely free, and it works cross-platform. Whether you're on Windows 11, ...
Ars Technica

trying to boot memtest86 DVD ISO in eg virtualbox

The "Bootable" legacy ISO you've used is in fact not bootable, it relies on CDROM emulation provided by BIOS. VMs don't usually do this sort of emulation. If you set the guest OS to something like ...