Modern versions of Windows are often distributed in the form of ESD files (Electronic Software Delivery).
This example demonstrates conversion of Windows 10 (Insider Preview) ESD file to bootable USB installer thumbdrive in UEFI mode.
1) Run FlashBoot Free or FlashBoot Pro, click Next
2) Choose "OS installer -> USB" in the Main Menu
3) Choose "Windows Vista/7/8/8.1/10 installer (for BIOS-based computers)" or "Windows Vista/7/8/8.1/10 installer (for UEFI-based computers)" in this menu and click Next
UEFI mode must be chosen if you want to install Windows to 3Tb+ boot HDD. It may be chosen if you have UEFI-compatible computer. Most computers manufactured after 2012 are UEFI-compatible, but if you intend to install Windows to older computer, then use BIOS mode instead of UEFI mode.
4) Specify ESD image file of Windows setup and click Next
5) Specify target USB storage device and click Next
6) If necessary, change volume label, or leave it as is, and click Next
7) Check summary information and click Format Now
8) Wait for process completion
9) Bootable USB storage device is ready to use. Click OK to exit
