Why it doesn’t surprise me anymore?

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System partition and boot partition From Wikipedia, the free encyclopedia "System partition" redirects here. Not to be confused with EFI system partition. "Boot partition" redirects here. Not to be confused with BIOS boot partition. The system partition and the boot partition (also known as the system volume and the boot volume) are computing terms for disk partitions of a hard disk drive or solid-state drive that must exist and be properly configured for a computer to operate. There are two different definitions for these terms: the common definition and the Microsoft definition.