When To Remove Usb While Installing Windows 10. Early on in the process Windows will copy all the files it needs from the USB drive to your hard drive. If there are any write operations in progress, Windows will make sure that everything is complete before ejecting the drive.
This will disable all the compatibility checks for Secure Boot, TPM. Make sure that there are no important files on the USB drive. Select Taskbar corner overflow to expand it.
One of the first thing the update does is copy over the needed files from the installer location, whether it be a USB, DVD, local, or whatever you use.
In the Update & Settings window, on the left-side, click on Recovery.
Click the "I don't have a product key" option. Here, you can see all the partitions and drives from your PC, including external ones. Once you have a backup of your files, you can install Windows from a USB drive without any worries.