https://stackoverflow.com/questions/57389189/create-pure-uefi-bootable-iso-from-directory
Disk disk.iso: 14.7 GiB, 15728640000 bytes, 30720000 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: 1AC54773-B7F8-B849-BE94-2313AE45E18D
Device Start End Sectors Size Type
disk.iso1 2048 206847 204800 100M EFI System
disk.iso2 206848 14886911 14680064 7G Linux filesystem
disk.iso3 14886912 29566975 14680064 7G Linux filesystem
user@Azeria-Lab-VM:~/Desktop/tcc$ sudo losetup --offset $((512*2048)) --sizelimit $((512*206847)) --show --find disk.iso
/dev/loop13
user@Azeria-Lab-VM:~/Desktop/tcc$ sudo losetup --offset $((512*206848)) --sizelimit $((512*14886911)) --show --find disk.iso
/dev/loop27
user@Azeria-Lab-VM:~/Desktop/tcc$ sudo losetup --offset $((512*14886912)) --sizelimit $((512*29566975)) --show --find disk.iso
/dev/loop28