I have installed VirtualBox (version 5.22 with latest guest additions) on MacBook Pro (running Yosemite) and have one VM which is running Windows 7.
I want to upgrade this to Windows 10. The Windows 10 upgrade guide says that I need 8GB of disk space on the VM. My VM has 12 GB of free space. My Mac host has 40GB of disk space free.
When I try to run the update I notice that when it reaches 20%-21% percent, the host runs out of disk space, the VM aborts and I am not able to start it.
Why is this happening? How do I fix this problem?