Inaccessible Disk / Existing UUID
If you should encounter an error saying that the virtual machine disk is inaccessible or that a disk with this UUID already exists, this can be fixed by removing the disk and adding it back.
- Right click on the virtual machine in the left pane of the VirtualBox Manager and click Settings. Navigate to the Storage section.
- Right click the .vdi image and click Remove Attachment.
- Right click "Controller: SATA" and click "Add Hard Disk." Click "Choose existing disk."
- Navigate to the virtual machine .vdi file and press "Open."