Using shared folders, if the underlying shared resource becomes unavailable, you cannot remove it from its previously assigned VBOXSVR mapping.

[cboyd]

Share a resource permanently, read-only, say E:\mp3 -> mp3. This will show up in the guest OS as \VBOXSVR\mp3. Then change the drive letter or make the resource generally unavailable (e.g. no E: drive). Then try to go in to shared folders and remove it - this will appear to work successfully. But if you go into the guest OS and browse, \VBOXSVR\mp3 will still be there! Nothing you do within Vbox will make that change - rebooting, logging out as different user, etc.

I've attached virtual machine config files as well.

WORKAROUND:

• Shut down the guest OS
• Go to MachineDisks and find the guest OS's .xml file.
• Find section SharedFolders/SharedFolder which corresponds to share you're trying to remove.
• Change or remove the entry to be correct.
• Restart guest OS virtual machine.
• Vbox appears to just remove the entry you modified in the .xml file regardless of whether you set it to a valid value or not.
• Re-add the changed resource path (if you want to change it).

[cboyd]

Original file (stuck VBOXSVR shares)

[cboyd]

I modified entries to fix where the resource moved to, and then re-started/shut down virtual machine