EFI System partition
The EFI System partition (ESP) is a partition on a data storage device that is used by machines that adhere to the Unified Extensible Firmware Interface (UEFI).
It contains the boot loader programs for all operating systems installed (in other partitions) on the device, device driver files (used by the firmware at boot time) for other devices, system utility programs that are intended to be run before an operating system is booted, and data files such as error logs.
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