Right click on the drive, and select Format. How to format using exFAT (on Windows): Plug the disk into a Windows Vista SP1 or Windows 7 computer. I will leave Windows instructions below for the benefit of Windows users.
FAT32 (File Allocation Table) Read/Write FAT32 from both native Windows and native Mac OS X. AirPort Extreme (802.11n) and Time Capsule do not support exFAT Maximum file size: 16 EiB Maximum volume size: 64 ZiB You can use this format if it is supported by all computers with which you intend to share the drive.