I'm curious about how Qubes does this:

mounts /home/user and other user-related directories from disk B
mounts the / from disk A, but when VM shutdowns, disk is discarded

I'm curious on how it mounts disk A. I don't think it makes a copy of disk 
A to a temporary disk A', because that'd move lots of gigabytes on every VM 
startup.
However, it also can't mount disk A as read-only, because I can write to 
it, it just gets discarded.
How does this work? And is it exclusive of Xen? Couldn't I do the same in 
KVM? It's very useful

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