Mount error with persistence file

[avggeek]

I use Win10 with VBox 5 and VMUB all the time (about 10-50 times a day). It is the best way to boot from USB using VBox.

As per https://www.virtualbox.org/wiki/Downloads, VBOX 5 was only supported till July 2020 and is now EOL. While it might continue to work in Windows 10, it can break at any time and there will be no fixes forthcoming.

[Steve2926]

Sure - but if you want to test booting from USB drives using VBox, then it is a solution that works well.
If you prefer not to use a solution that is tried and tested and has worked well for many years, then that is your choice.