VBox: "Unsupported version 2 of data unit" after snapshot was restored

[Bernhard Froehlich]

On 30.01.2012 09:26, Yuri wrote:
> After I restored the snapshot (of Windows 7 guest) I get such error
> while launching the machine again:
> "Unsupported version 2 of data unit '8237A" (instance #0, pass 
> 0xffffffff)
> (VERR_SSM_UNSUPPORTED_DATA_UNIT_VERSION)
>
> I am not sure if this is FreeBSD specific or generic.
>
> FreeBSD-9.0-STABLE amd64
> virtualbox-ose-4.0.14

 From vbox developers:
Up to version 4.0 vbox used only version 1 of saved state of the DMA 
controller.
With vbox 4.1 a new version 2 was introduced which cannot be used with 
an older
vbox version.

So have you probably created a snapshot with a newer vbox 4.1.x and 
then switched
back to vbox 4.0.x and restored the snapshot there? If that is the case 
you can
restore the snapshot with 4.1.x and be sure that there is no saved 
state anymore
and then switch back to 4.0.x.

-- 
Bernhard Fröhlich
http://www.bluelife.at/