Hello, If I understand correctly, it seems the minimum size (32MB, 100MB or 260MB) of the ESP depends on the sector logical and physical size of the disk: https://docs.microsoft.com/en-us/windows-hardware/manufacture/desktop/configure-uefigpt-based-hard-drive-partitions#diskpartitionrules https://en.wikipedia.org/wiki/Advanced_Format#Categories
fdisk ou parted will inform you of these sizes In my case: didier@hp-notebook14:~$ sudo parted -l [...] Model: CT500P1SSD8 (nvme) Disk /dev/nvme0n1: 500GB Sector size (logical/physical): 512B/512B Partition Table: gpt Disk Flags: Number Start End Size File system Name Flags 1 17,4kB 16,8MB 16,8MB Microsoft reserved partition msftres 2 16,8MB 571MB 555MB ntfs Basic data partition hidden, diag 3 571MB 676MB 105MB fat32 EFI system partition boot, esp 4 676MB 52,4GB 51,8GB ntfs Basic data partition msftdata 5 52,4GB 53,1GB 700MB ext4 6 53,1GB 500GB 447GB lvm So my ESP has the minimum size for the sectors logical/physical size I am dual booting Debian 10 and Windows10 didier@hp-notebook14:~$ df /boot/efi Sys. de fichiers blocs de 1K Utilisé Disponible Uti% Monté sur /dev/nvme0n1p3 98304 35864 62440 37% /boot/efi IMO, you can safely reduce the size of your ESP
