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I have 2 OS installed debian 8 and windows 10. In fdisk I discovered that the boot flag is on the first partition. The first section (500m) needed to boot windows. So when you start the computer needs to boot windows. But to boot grub. So why boot grub instead of windows. And where it is if it has no partition?

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OS not loaded from the boot partition. The boot partition in your MBR (master booth record) stores the boot loader that is loaded and after that offers or ship system, which can be on virtually any topic and any drive.
Some loaders are large, so in the MBR is only part of it, and then load the rest. In Windows for example is it in the directory Boot