When were dealing with uefi the boot process is very

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When we're dealing with UEFI, the boot process is very different then it is if we're dealing with a BIOS implementation. With a BIOS implementation we specify a particular device to look for an operating system on. With UEFI we instead specify a boot option instead of a device. If we come over here to add boot option I can come over here under file system list and select a particular file system, this system has three hard disk drives as you can see here. So I would select the device here and then I would use the browse button here to go and select the particular file name. We're not actually going to use a UEFI boot in this demonstration. We're going to go back and use a BIOS based option for booting this system so I'm going to mark legacy and when I do instead of selecting from a particular boot file that I want to use like I would with UEFI, I select the devices that I want to boot this system from. Now notice that the devices that firmware's going to access to find an operating system on are listed in the order in which they will be checked. First of all the firmware is going to look at my floppy disk drive. Then it's going to look on my hard disk drive. Then it's going to look on any USB storage devices connected to the system. Then it's going to look on the DVD drive and then if it all else fails, it will do what we call a pixie boot where it will go out on the network and try to find an appropriate boot server and launch the operating system from that server over the network connection. Upgrading Windows 3:51-5:56 Now remember in this scenario I've got an existing Windows 7 system. And I want to upgrade that Windows 7 system to Windows 10 by running the upgrade from a USB storage device. Do you see a problem with this current configuration? You're right it's never going to get to the USB storage device in the boot process because the firmware will first look on the floppy disk drive to try to find an operating system and there is no disk in the drive hence it won't work and so the next thing it will do is look for an operating system on the hard disk drive and guess what it's going to find? It's going to find the Windows 7 operating system on the hard disk drive and it's going to boot it hence it will never get right here. So what can we do? Well one option would be to see if there is a boot menu option when the system first starts up. Most BIOS and UEFI firmware provide that option so that you can customize the way the system boots in which I press the appropriate keystroke and then select the device that I actually want the system to boot from in which case the firmware would ignore this list and go with the boot device that I told it to. That option works great, the problem with it is though that sometimes that menu flashes by so fast that it's hard to hit the right keystroke.
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