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I understand that my post is long, but it states explicitly that sharing is not an issue. Also, that the drive does not contain important data. So there is no operating system on it. Do you happen to know how to "unmount" the disk in Windows if you think this is the problem here?
– phobic
Commented Nov 23, 2013 at 21:57
Sorry, I have overlooked the sharing part. To "unmount" the disk, I think unassigning all drive letters or mount points from the partitions on that drive should be enough. You can do that in the Computer Management window (right-click Computer in the Start menu and click Manage). If that doesn't work, try with individual partitions instead of entire drive (a partition spanning over entire drive should work too). VBox manual covers this topic. Note that disks are indexed from 0, but partitions start from 1.
– gronostaj
Commented Nov 23, 2013 at 22:14
After unmounting the disk in Windows I can still reproduce the error with the above script.
– phobic
Commented Nov 23, 2013 at 23:41
Try rebooting. Reinstalling the same or updated version of VirtualBox may help too, there are some known issues with VMDK that are solved by VBox reinstallation.
– gronostaj
Commented Nov 23, 2013 at 23:45
After "repair" installation of the newest VB and reboot of the host and guest, I can still reliably reproduce the error.
– phobic
Commented Nov 25, 2013 at 11:59

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