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# How Partitions and File Systems Work (5 of 5) - How Partitions are Used During the Boot - With MBR hard drives, one of the primary partitions is designated the active partition, which is the bootable partition that startup BIOS/UEFI look to when searching for an OS. - In GPT system, the b...

# How Partitions and File Systems Work (5 of 5) - How Partitions are Used During the Boot - With MBR hard drives, one of the primary partitions is designated the active partition, which is the bootable partition that startup BIOS/UEFI look to when searching for an OS. - In GPT system, the bootable partition is called the EFI System Partition (ESP). - UEFI turns to it to find and start the OS. - In Windows, the MBR active partition or the GPT ESP is called the system partition. - For Windows 10/8/7, the boot manager program is named BootMgr (no file extension). - Boot manager turns to the volume that is designated the boot partition, where the Windows OS is stored.