On Fri, 17 May 2024 at 17:14, tom ehlert via Freedos-devel
<freedos-devel@lists.sourceforge.net> wrote:

> > Below 1GB FAT16 uses 8kB clusters. From 1GB-2GB it uses 16kB ones.
> > (Below ½GB it uses 4kB.)
>
> That would require FAT17.

(?)

Not at all.

Here is the full list:

FAT12

Drive size Secs/cluster   Cluster size
 <  16 MB       8             4 KiB

FAT16

Drive size Secs/cluster   Cluster size
< 128 MB       4             2 KiB
 < 256 MB       8             4 KiB
 < 512 MB      16             8 KiB
 <   1 GB      32            16 KiB
 <   2 GB      64            32 KiB
 <   4 GB     128            64 KiB   (Windows NT only)
 <   8 GB     256           128 KiB   (Windows NT 4.0 only)
 <  16 GB     512           256 KiB   (Windows NT 4.0 only)

FAT32

Drive size Secs/cluster   Cluster size
 < 260 MB       1           512 bytes
 <   8 GB       8             4 KiB
 <  16 GB      16             8 KiB
 <  32 GB      32            16 KiB
 <   2 TB      64            32 KiB

Source:
https://www.win.tue.nl/~aeb/linux/fs/fat/fat-1.html

Confirmation:
https://www.researchgate.net/figure/Default-cluster-size-for-FAT-compatible-OS_tbl1_261851917


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