VirtualBox 3.2 and up, at least to version 3.2.4, ignores the autoreset property of differencing disks, according to The Grey Blog, whose author explains, "This basically means that, after stopping and starting a virtual machine, the differencing disks won't be wiped off automatically hence changes made into your guest instance will be persisted upon reboot." He also offers an introduction to differencing disks and immutable images in a secondary blog entry. [...read more...]
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VirtualBox Bug Disrupts Autoreset of Differencing Disks
(this article)
