Ticket #7280 (closed defect: obsolete)

Opened 8 years ago

Last modified 21 months ago

Take a snapshot and attached disks are detached

Reported by: MarkCranness Owned by:
Priority: major Component: other
Version: VirtualBox 3.2.8 Keywords: snapshot detach
Cc: Guest type: other
Host type: other

Description (last modified by aeichner) (diff)

In some circumstances (VMs with shared attachments), taking a snapshot causes attached drives to be un-attached / removed.


  • Two new machines (A, B) with no attachments, 5 virtual disks: A1, A3, B1, B3, SHARED.
  • Attach to A the following disks (in this order): A1, shared, A3 and add a CD/DVD controller and drive and a floppy controller and drive.
  • Attach to B the following disks, B1, shared, B3 and add a CD/DVD controller and drive and floppy controller and drive.
  • Take a snapshot on A. Not that now only A1 is attached, and the other disks AND the CD/DVD drive and floppy drive have been removed.
  • Attempt to-reattach A3 to VM A. Note that A3 is shown with the blue star icon, indicating that a differencing disk is attached somewhere (so VB thinks).
  • Virtual Media Manager > Observe that A3 does NOT have a differencing disk.
  • Restore Snapshot on A and Delete Snapshot on A
  • (STRANGE!) Repeat add drives to A and snapshot and this time the snapshot does not remove the attachments!
  • Delete Snapshot, and observe: "Failed to delete the Snapshot 1 of the virtual machine A. Medium 'C:\...Shared.VDI' is locked for writing by another task."
  • Close VirtualBox, wait for VBoxSVC.exe to stop, Delete snapshot 1 works. Re-add snapshot, followed by Delete snapshot gives error above again.

Change History

comment:1 Changed 8 years ago by frank

  • Description modified (diff)

comment:2 Changed 8 years ago by MarkCranness

Another person has reported the same problem:

comment:3 Changed 21 months ago by aeichner

  • Status changed from new to closed
  • Resolution set to obsolete
  • Description modified (diff)

Please reopen if still relevant with a recent VirtualBox release.

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