(In reply to Nikolai Nikolaevskii from comment #3) > https://docs.microsoft.com/en-us/windows-hardware/manufacture/desktop/ > configure-uefigpt-based-hard-drive-partitions > > Citation: ... > For Advanced Format 4K Native drives (4-KB-per-sector) drives, the minimum > size is 260 MB, due to a limitation of the FAT32 file format. The minimum > partition size of FAT32 drives is calculated as sector size (4KB) x 65527 = > 256 MB. Why did we choose a minimum of 256 when the explicit minimum on Windows is not 256, but 260? Were someone with a 4K sector boot disk and 256 ESP wanting to add Windows to the system, it would require an additional ESP partition according to the referred to Windows document.