In this case I would use
sudo dump.exfat /dev/sdb1
(alter /dev/sdb1 according to your system)
In the bottom section you find your cluster size in Bytes.
Save the complete output of dump.exfat and then do your Windows thing to the drive (format with maximum allocation unit size) then do dump.exfat again and compare the outputs.
So you know what cluster-size to choose with Linux next time.
Please share dump.exfat outputs. I’m curious.
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