Comment # 3 on bug 1177358 from Nikolai Nikolaevskii

(In reply to Ancor Gonzalez Sosa from comment #1)
> (In reply to Nikolai Nikolaevskii from comment #0)
> > Why openSUSE installer specifies "EFI system partition" as VFAT?
> > What file system is actually used?
> 
> See more information about the current behavior (that we are considering to
> adjust) here:
> https://bugzilla.suse.com/show_bug.cgi?id=1170625
> 
> > By standard we need FAT32 for EFI system partition + fixed drives:
> 
> I wouldn't say "need". But it's indeed recommended.
> 
> >  
> > [...]
> > 
> > Windows requires FAT32 for EFI system partition.
> 
> Not in our experience. Can you point to some source of information proving
> that?

https://docs.microsoft.com/en-us/windows-hardware/manufacture/desktop/configure-uefigpt-based-hard-drive-partitions

Citation: 
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...
The minimum size of this partition is 100 MB, and must be formatted using the
FAT32 file format.

This partition is managed by the operating system, and should not contain any
other files, including Windows RE tools.

Note

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.

Advanced Format 512e drives are not affected by this limitation, because their
emulated sector size is 512 bytes. 512 bytes x 65527 = 32 MB, which is less
than the 100 MB minimum size for this partition.
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1. Please specify format for EFI system partition = FAT32 + VFAT as default
with size > 100 MB.
2. Please give users a choice to choose between FAT32 and FAT16/FATxx (maybe
useful for some ill-designed hardware).
3. IMHO using VFAT is a good default setting.