Change default storage path
From the VirtualBox Manager we can define the default location of Virtual Machines by choosing a location path, which can also be on a different drive if this drive was mounted with r/w permissions:
Create a VDI on a different path
If that drive is not for general use we can also create a virtual drive we had stored on a different path (click on ):
Load a VDI to an existing VM
Any VDI located on a different drive can also be attached to a virtual machine on the machine's storage settings. Click on then choose a virtual hard disk file on any path of mounted drives.
To avoid an error when starting a virtual machine we have to take care to Always mount the drive holding our VDIs before we start Virtual Box.