To ensure the partition can be formatted to FAT32, it should be at least 36 MiB on drives with 512 byte logical sector size and 260 MiB on drives with 4096 logical sector size.
For early and/or buggy UEFI implementations the size of at least 512 MiB might be needed.To confirm this is the ESP, mount it and check whether it contains a directory named EFI, if it does this is definitely the ESP. The list of partitions on the disk: Look for the EFI system partition in the list, it is usually at least 100 MiB in size and has the type EFI System or EFI (FAT-12/16/32).The disk's partition table: it indicates Disklabel type: gpt if the partition table is GPT or Disklabel type: dos if it is MBR.To find out the disk partition scheme and the system partition, use fdisk as root on the disk you want to boot from: If you are installing Arch Linux on an UEFI-capable computer with an installed operating system, like Windows 10 for example, it is very likely that you already have an EFI system partition. The EFI system partition (also called ESP) is an OS independent partition that acts as the storage place for the UEFI boot loaders, applications and drivers to be launched by the UEFI firmware.
