> > VirtualBox supports "two VM's with one shared disk
> > between them."
>
> Does it actually allow one shared disk between two VMs?
> Correct me if I'm wrong but they'd not both be writable?

The capability is described in section 9.9 of the User
Manual.  It can be configured to be writable or readonly
individually for each guest.  It is the responsibility
of the guests to provide whatever sharing mechanism they
may need for the data on the disk.

By the way, just because VirtualBox is allowing
multiple guests to write to an area on the disk does
not imply they are necessarily going to access that
area at the same time.  For example one Linux guest
could mount a disk partition read-write, make some
changes, then unmount the partition.  Another Linux
guest could later do the same thing.  Then the first
one could mount it again, etc.


Larry

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