
AirPort Extreme (802.11n) and Time Capsule do not support exFAT. Not all Windows versions support exFAT. Supported in Mac OS X only in 10.6.5 or later. You can use this format if you only use the drive with Mac OS X, or use it for backups of your Mac OS X internal drive, or if you only share it with one Windows PC (with MacDrive installed on the PC). To Read HFS+ (but not Write) from Windows, Install HFSExplorer.
Required for Time Machine or Carbon Copy Cloner or SuperDuper! backups of Mac internal hard drive. Mac OS Extended (Journaled) Don't use case-sensitive) HFS+ ((((MAC FORMAT)))) (Hierarchical File System, a.k.a. You can use this format if you routinely share a drive with multiple Windows systems. AirPort Extreme (802.11n) and Time Capsule do not support NTFS. Native NTFS support can be enabled in Snow Leopard and Lion, but is not advisable, due to instability. For Mac OS X 10.4 or later (32 or 64-bit), install Paragon (approx $20) (Best Choice for Lion). To Read/Write/Format NTFS from Mac OS X, here are some alternatives:. You can use this format if you share the drive between Mac OS X and Windows computers and have no files larger than 4GB.
Read/Write FAT32 from both native Windows and native Mac OS X.What is the drive formatted as? this is extremely likely the issue.