I created a virtual disk file VM_1_Ubuntu.vdi. Then I moved it into another folder. I tried to update VM settings (right click on virtual machine -> settings -> Storage -> Controller SATA tab, VM_1_Ubuntu.vdi path). I wanted to set a new path.
It says Cannot register the hard disk already exists
Open up the Command Prompt. In both Windows 8 and Windows 7, it can be found by typing “cmd” into the Start Menu search box. If everything worked, you should see a message saying “UUID change to: …” and then the VirtualBox should work. All fixed!
The UUID is generated when you power on or reset the virtual machine. As long as you do not move or copy the virtual machine to another location, the UUID remains constant. Fore more read the documentation. You can use: VBoxManage list vms. to list all currently registered VMs with their settings, names and UUIDs.
I found a solution
File -> Virtual Media Manager -> Removed existing images (note, I removed them only from the registry).
I followed these steps.
http://www.webdesignblog.asia/software/virtualbox-moving-vdi-file-re-linking-guest/#sthash.1QOHeiw5.dpbs
After that I could update the path in the VM settings.
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