ATTENTION! Your Fantom Drives disk drives comes preformatted with the FAT32 file system. The FAT32 file system is the most portable file system available, but does present a few drawbacks: 1. FAT32 imposes a 4GB maximum size per file limit 2. FAT32 is not fully compatible with MacOS file repair utilities, and may become unusable if corrupted. If you do not require Cross platform compatibility, please consider reformatting your drive with a more system-specific file system: For use with OS X, please format using HFS+ file system For use with Windows 2000/XP/2003, please format using the NTFS file system