I have an iMac (8,1) with OS X Lion, Windows 7 in Bootcamp and have installed Mint onto an external (120g) firewire drive using a liveDVD. I manually partitioned the external with EXT4 file systems on the root, boot and home partitions. At this point everything worked fine. After rebooting the only way I can get back into Mint is by booting off the liveDVD. In the OS X disk utility I can see the external drive but the four partitions are grayed out (not mounted?). I assume that the problem lies with the EXT4 file systems, which OS X cannot recognize. Grub is installed on the external drive and using rEFIt on the Mac. I do not wish to disturb the Mac install. Windows and Mint can be deleted/reinstalled without a problem. I have considered deleting Bootcamp and doing a manual partition of all drives. Hardware wise I have an internal 320g HDD, a 1tb external (half forTime Machine backup, half for data) and the 120g with Mint installed. I would like to have some sort of bootloader on Mac OS X which could point to Mint and Windows in their own partition(s). I don't particularly want to partition the internal drive for all three operating systems.
Oh, virtual installs are not an option. (VMWare Fusion and Parallels are sitting on my bookshelf gathering dust) Any recommendations would be appreciated. Thanks in advance.