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I was playing with qemu on Linux when I discovered that I could just run And it would boot up my system again! I closed qemu immediately after Grub was loaded successfully though, because the command is run using Could anyone explain how dangerous this could be?
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I would say it is incredibly dangerous. You are right in your supposition that it would likely damage your /dev/sda. Two systems accessing the same block device, each with their own cache and buffers, will definitely mean that each has a different idea of what is actually on the filesystem - changes made by one operating system will not be propagated properly to the other and you will start getting files overwriting each other. All in all a horrible mess. Now, if you had 2 operating systems installed on 2 different partitions (dual booting) you could use qemu to boot one of them inside the other, but you must never ever ever boot the same OS twice (unless it's a read-only OS like a live CD image for instance) | ||||
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