# Is it best to reformat our external Hard drive to exFAT for compatibility with Mac

exfatfilesystemsntfs

I just got one of those Western Digital 2TB Passport external hard drive. Is it true that if I want the iMac running Lion on it to be able to read and write any files on the drive, and to have files greater than 4GB (which FAT can't have), then it is best to reformat immediately to exFAT before writing anything to this new drive?

You can create a UDF filesystem using newfs_udf on OS X 10.5 or newer.