In reality, most computers don’t have a built-in SD card reader. If your computer has a built-in SD card reader and your computer’s BIOS supports booting from that reader, then you’re good. Logically enough, your computer’s BIOS determines what devices you can boot from. In other words, it’s the BIOS that does the booting. Aside from some housekeeping when it starts, it’s there and running the instant you turn on your computer.Ī BIOS has several different jobs, one of which is to load the operating system. The computer’s BIOS is built into the hardware. What controls the booting process is the computer’s BIOS - or UEFI, the more secure and powerful BIOS replacement. Not only is Windows not involved it may not even be installed on the machine. Your machine could boot into Linux or some other operating system entirely. The boot process loads Windows, 2 so booting starts before Windows comes into play. Windows doesn’t control the first part of the booting process because Windows isn’t running yet. Note that I said, “Load the operating system software.” That’s our clue as to why Windows doesn’t care what you boot from.
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It’s mostly about loading the operating system software, such as Windows, but can also involve any software configured to run when a computer starts. In the realm of computing, to boot something means the process of starting up a computer or similar device from some inactive state to a working, functional state. To “boot” something is a term derived from “bootstrapping”, which in turn came from the phrase “to pull yourself up by your bootstraps”. If your computer can boot from a USB device, a thumb drive removes all confusion, but a USB SD card reader or similar device may also work. Whether or not your computer supports booting from an SD card varies based on the computer.
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What devices can be used to boot is controlled by your computer, not Windows.