Windows Sandbox will not use VHDs but will run as clean as a brand-new installation of Windows. Once the Windows Sandbox is closed, everything is discarded permanently. The feature relies on the Microsoft hypervisor to run a separate kernel which isolates the virtualized environment from the host.
Windows Sandbox has the following properties:The feature is available to Windows Insiders in Windows 10 build 18305, it's unknown when it will become part of the mainstream release of Windows 10 -- perhaps with the rollout of the 1H 2019 update. To use Windows Sandbox, users will need a Windows 10 Pro or Enterprise operating system with a 64-bit processor, at least 4GB RAM, at least 1GB free disk space, and at least two CPU cores.
Part of Windows – everything required for this feature ships with Windows 10 Pro and Enterprise. No need to download a VHD! Pristine – every time Windows Sandbox runs, it’s as clean as a brand-new installation of Windows Disposable – nothing persists on the device; everything is discarded after you close the application Secure – uses hardware-based virtualization for kernel isolation, which relies on the Microsoft’s hypervisor to run a separate kernel which isolates Windows Sandbox from the host Efficient – uses integrated kernel scheduler, smart memory management, and virtual GPU