Hi I just switched to Mac! I've been having problems with my External HDD in Yosemite. It's already formatted to ExFat, so I can use it both on windows and Mac. Anyway, I see that there's a mac firmware update for the external drive, BUT the firmware on it now was installed in windows. Will the drive be corrupted if I update on Mac? I need this update because it solves a lot of problems with the drive not being mounted after sleep etc.