Microsoft has a dedicated tool that you can use to download the windows 10 system image also referred to as iso and create your bootable usb drive.
Windows 10 thumb drive size.
To boot from cd you need to re arrange the boot device priority sequence to your bios.
Choose a location on your hard drive to store the windows iso file and click save.
Take a look at the size column and figure out which disk number your usb drive is.
Make sure you have plugged the usb flash drive into the computer.
Remove the usb flash drive.
The program will detect the device automatically.
Follow the instructions to install windows.
See the above instructions to create the usb.
Turn on the pc and press the key that opens the boot device selection menu for the computer such as the esc f10 f12 keys.
Connect the usb flash drive to a new pc.
Create a bootable usb drive of windows 10.
Select the option that boots the pc from the usb flash drive.
For example you might want to reformat a new or used removable storage device to make sure it.
Create a windows 10 usb flash drive and guide to install windows 10 using a usb device.
Use microsoft s media creation tool.
Using the tool to create installation media usb flash drive dvd or iso file to install windows 10 on a different pc click to show more or less information follow these steps to create installation media usb flash drive or dvd you can use to install a new copy of windows 10 perform a clean installation or reinstall windows 10.
Confirm the backup settings and click start backup to image windows 10 to usb drive.
Select the usb flash drive to save the windows 10 backup.
Insert the usb to your pc and restart it.
To be clear both these approaches will only show you how to put windows 10 on a usb flash drive.
When the process is done click finish.