By using a 240-volt circuit (such as the outlet for an electric dryer), the car might be able to receive 240 volts at 30 amps, or 6.6 kilowatt-hours per hour. This arrangement allows significantly faster charging, and can fully recharge the battery pack in four to five hours.
EXFat is just an extended version of the FAT format. Unlike FAT, and FAT32, it can support files as large as 16 Exbibytes, and can support disk sizes up to 64 Zebibytes. FAT32 only supports files as large as 4GBs, and drives as large as 2TBs.
Unfortunately none are exactly perfect. FAT (especially FAT32) is the most conformant between the two, but has some serious issues. E.g. 4GB file size limit, block sizes scaled to several megs making even small files waste lots of space, fragmentation being very prevalent, etc. ExFAT is slightly better, but still has most of the same issues, and addionaly only later OSXs are able to make use of it. NTFS is reasonable.