Re: Does anyone here use exFAT?
Yes, 256 G micro SD cards use it and should not be be reformatted without special tools.
Possibly most SDXC cards (64 G and larger?) use exFAT by default, I'm not sure.
Certainly actual gadgets have limits on format types and sizes, I think notable boundaries being 2G or 4G (4G can be SDHC or SDHC). Usually FAT
4G to 32G SDHC, always FAT32 by default.
64G to 2T SDXC usually exFAT. There is though no assurance that something that works with a 256 G SDXC card using exFAT will work with a larger card.
Most gadgets only work with cards up to a certain size and in the default format for that size. So while Ext2, 3 & 4 or NTFS will work on a laptop, they are unlikely to work on a camera, MP3 player, Zoom/Tascam recorder, portable video camera, phone or tablet.
I've not seen an SDUC card yet, which I presume also uses exFAT. Probably 2T to 128 T. I noticed 512 G cards yesterday and noted that the the 256 G micro SD card I bought early this year has dropped about £10 in price to about £28.
You need the reserved space for the onboard controller to silently swap dying memory locations.