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How can I do this with open BSD?
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The ramdisk kernel (bsd.rd) functions without mounting any physical drives. This is why it's called the "ramdisk kernel". Using it, an admin can reinstall or upgrade, including an upgrade-in-place of the installed system, which replaces boot blocks, kernels, and userland libraries and executables (/bin, /sbin, /usr/bin, /usr/lib, /usr/sbin, /usr/libexec, and I'm sure a few other structures I've forgotten).
An admin can also use the ramdisk kernel to restore a complete system from backup, assuming of course, that the admin has invested the time to learn how to do so. Learning how restore a complete system to a "bare" computer should be at the top of your priority list, if you have one. HINT: If you don't have a spare computer, virtual machines are an easy way to practice and learn. You may find the qemu package helpful, if you want to run a virtual machine with OpenBSD as the host.
Obviously, you could boot the installed bsd.rd kernel, or, boot the ramdisk kernel from standard installation media: diskette, cd, or network.