After I upgraded my Virtualbox server to 3.2.8 I was unable to access certain disk images. I got the error

The medium type <path to image file>.vmdk is differencing but it is not associated with any parent medium in the media registry

I was able to fix all images with a tool called VBoxFixHdd which is described in this forum entry.

The medium type
> C:\...\ftp_server.vmdk is differencing but it is not associated with any
> parent medium in the media registry
Error "The medium type ... is differencing but it is not associated with any parent medium in the media registry" after upgrading to Virtualbox 3.2.8
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