5

I'm trying to virtualize my physical Boot Camp partition, so I can do small Windows tasks from Mac without restarting. I followed mostly this tutorial but also read others.

But now when I try to launch the VM it prompts this: VD: error VERR_NOT_SUPPORTED opening image file

enter image description here

Any idea what could I try?

  • Did you try: ...disabling the use of the new async I/O code... done by ticking "Use host I/O cache" for the SATA (and SCSI) controllers...? – klanomath Jan 17 '16 at 12:35
  • That was it! It works now! If you want to include it as an answer I'll .. ? – Toni Michel Caubet Jan 17 '16 at 12:39
  • OK I will write a short answer – klanomath Jan 17 '16 at 12:39
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This was (or obviously still is in VirtualBox 5?) a known bug of VirtualBox 3 which should have been fixed in 4.0.0!

The workaround is disabling the use of the new async I/O code... done by ticking "Use host I/O cache" for the SATA (and SCSI) controllers.

  • I never had this problem until I upgraded my host OS from Mavericks to El Capitan. Then suddenly my VMs stopped booting. Problem persisted through a subsequent VirtualBox upgrade from 4 to 5—but this workaround solved it: thanks! – jez Aug 5 '16 at 14:39

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