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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?

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  • 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
    Commented Jan 17, 2016 at 12:35
  • That was it! It works now! If you want to include it as an answer I'll .. ?
    – Toni Michel Caubet
    Commented Jan 17, 2016 at 12:39
  • OK I will write a short answer
    – klanomath
    Commented Jan 17, 2016 at 12:39

1 Answer 1

Reset to default
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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.

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  • 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
    Commented Aug 5, 2016 at 14:39
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    I am on VirtualBox 6.0.12 and getting this. The workaround here doesn't seem to work.
    – Matt
    Commented Oct 11, 2019 at 1:17
  • I tried this on VirtualBox 6.1 and it still failed. Could this have to do with the harddisc file is on another drive than the Virtualbox? I normally do not have issues with this, however this is a .vhdx file which was created and running fine in Hyper-V and that one can NOT use harddisc from shared drives, and so I was thinking this could be related, however not sure
    – serup
    Commented Aug 27, 2021 at 13:40

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