On 29 October 2012 21:19, jdd <[email protected]> wrote:
> in what order? top to bottom or bottom to top (in the list)?

A few lines later I wrote:
> - Select the topmost snapshot in the VirtualBox UI, and click "Delete 
> Snapshot",
> - Wait.  DO NOT Cancel, as that may damage the files (I'm not sure)
> - That will remove the topmost snapshot and move the rest up,
> - Repeat : Check free space, select topmost snapshot and click "Delete

If you intend to eventually delete all snapshots, then deleting from
the top tends to minimise total disk IO.
If you intend to leave some snapshots, then delete from the bottom up
towards those you will keep, and from the top down towards those you
will keep.

Deleting the topmost snapshot (so I've been told) is a 'backwards
merge' : the topmost differencing disk is merged into the base hard
disk.
Deleting a snapshot other than the topmost is a 'forwards merge' : the
differencing disk is merged into the following differencing disk
(which might be for the "Current State").

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