Some questions:
1. On what system did you run WintoUSB? Windows 10 Enterprise? I use Windows 10 Pro.
2. Which version of WintoUSB did you use - free or paid? I use the free version, so I can choose the non-Enterprise only.
After selecting the ISO (Windows 10 Pro), the select destination disk screen came up. Selected SanDisk Extreme, it popped a dialog saying that "Windows performance might be impacted if you use this USB flash drive to create Windows To Go workspace. Selected drive needs to be formatted. Are you sure you want to continue?" Clicked OK and it formatted the UFD to a single partition of NTFS. Afterwards, it prompted to select the system partition and boot partition. There was no choice, only one partition for both. Also, the "Legacy" option was disabled, leaving only VHD selectable. WintoUSB finally created a single-partition NTFS on the UFD, which can boot, install and run Windows 10 Pro on a Windows notebook. The problem is: it won't boot on the MBA. The MBA can't identify the UFD at all (holding Option key just after power-on).
