Modern Mac computers use the HFS+ file format, which has a maximum file size limit of about eight billion gigabytes. Therefore, about the only time you cannot transfer files larger than 4GB on a Mac is when trying to copy data to an external hard drive formatted with the FAT32 file format. FAT32 has a file size limit of 4GB, and if you attempt to transfer a file larger than that, an error occurs. To overcome the 4GB size limitation, you must reformat the external drive using the HFS+ file format. Warnings Writer Bio
