Does anyone know how Virtualbox creates its virtual disk? The documentation says it is just a file, but I would think it needs to be at least a vnode backed memory disk.
Don't know what you mean. VirtualBox gives the vm a preset amount of RAM out of the host's memory. The hard drive image can be an actual hard drive, a fixed-size file, or a variable-size vdi file that only tracks blocks that have been written.
I've always seen operating systems boot with a ram disk, but I never really knew why. After reading this, it seems like a legacy thing to support small boot media or low amounts of ram. I guess these restrictions don't affect Virtualbox.
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