Tim ha
There is a speed penalty if exfat is used as oppose to NTFS.Using ATTO and formatted as exfat:read speed = ~45MBswrite speed = ~15MBsUsing ATTO and formatted as NTFS:read speed = ~45MBswrite speed = ~17MBsWith exfat, the write speed actually fluctuates as the transfer size increases.  But using NTFS, the speed are consistent.Tested on Lenovo T530 using built in SD card reader.