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mkramer777Flag for United States of America

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Need help in updating windows 10 pro using a flash drive. Booting to usb drive when plugged in during installation.

I am upgrading several Windows 7 Pro computers to Windows 10 Pro.  I have a usb drive that contains the iso image for WIndows 10 Pro and a program to mount the iso.  When the install has finished with updates it begins to install Windows 10 Pro and then says that the computer will reboot several times.  My question is, when can I eject the usb drive that is plugged in?  When the computer reboots it tries to boot to the flash drive.  Other than changing this in the BIOS, is there a time before the 1st reboot that I can eject the USB drive (or pull it I guess since I am not seeing a windows screen at the time of install) and it will not need to read any data from it, or do I need to go the BIOS route?
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noxcho
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Just a side note: the (whole) WIM does not get loaded into RAM. I have upgraded computers that had less than 4 GB of RAM and the WIM is about 4 GB, so that would never work out, not even with compression. It gets copied locally.