


Windows Sandbox, a feature introduced in Windows 10 v1903, is a new lightweight desktop environment tailored for safely running applications in isolation. Windows Sandbox: an isolated, temporary, desktop environment where you can run untrusted software without the fear of a lasting impact on your PC. It’s a mounted virtual drive (.vhdx) which is used by the Windows Sandbox feature. PortableBaseLayer is not a malicious drive. What is PortableBaseLayer that shows up in Disk Management You may be wondering what exactly is PortableBaseLayer. PortableBaseLayer also shows up in the defragmenter (“Optimize drives”) window as a virtual hard disk.

When the PortableBaseLayer drive is right-clicked, all the options (except Properties) are grayed out.
