The interoperable file system that is nearly impossible to interoperate.  Introduced in 2006 by Microsoft, it eventually gained compatibility from XP to Windows 10.  Apple introduced support in 10.6.5.  Even Linux got to play thanks to Fuse.  It turns out that any reasonable sized drive prepared in windows will not be compatible with Mac and unable to mount. This is because Apple’s implementation of exFAT requires less then 1048576 bytes per cluster, where as Windows varies it’s cluster size depending on the capacity of the volume.  Best advise for mac people is to format it on windows, but set the block size to 1024. Can we get a new file system now please?