Feeling sick with your FAT32 portable harddisk which cannot store files bigger than 4G? Use ExFAT. Currently the most updated stable version of Mac OSX is 10.6.4. And it doesn’t support ExFAT formatting (except some models of Macintosh). The next version, however, support ExFAT. These days, I upgraded to the Mac OSX 10.6.5 Delta 10H555 in order to make my machine supporting ExFAT.