This is the etymology given in the Collins English Dictionary.ref Collins The word which is widely believed to be the root and one of the ones quoted by the Oxford English Dictionary is .
exFAT is an improved version of FAT32. It isnât as efficient as NTFS (Windows) but is cross compatible between Windows OS and Mac OS (since 10.6.5), unlike NTFS and HFS+. I recommend using it when compatibility between Mac and Windows is important, at the (small) cost of efficiency (such as file size bloating, transfer speeds, general performance). exFAT is the preferred format for flash memory, used for media such as SD cards and SSD. Written Jun 22.
For best results, your external hard drive, thumb drive, SDHC or SDXC card, or other storage device should be formatted as Mac OS Extended, not FAT, ExFAT, or NTFS. And to function as a startup disk, it needs to be using a GUID partition map. Here's how to check: Connect your external storage device to your Mac.