I wanted to add a Linux option to my hackintosh set up. I have my primary OS (10.6.8) on an SSD. I have Windows 7 and XP on a different drive (2 partitions). When I installed Linux (Mint from DVD) I messed up the booting of XP. That's OK. I will do something about that later and don't use XP much at all. I was surprised Linux did not mount when in OSX and I ended up reconfiguring by erasing the Linux partitions contents and formatting it FAT32 I think. A question is coming.....
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Seems like you may have solved your issue, I've done a few different computers with dual boot OSX/Linux . . . nothing with Windows. The Linux format should be similar to windows DOS or FAT . . . so there shouldn't be much of a problem there if you were adding Linux to the windows HD, right? I think this relates to the use of BIOS??? But OSX uses EFI . . . and indeed, if I boot from OSX using "option" boot loader, Linux partition will not show up--OSX does not recognize other systems. So, the general rule is that Linux "goes in last" . . . if you install after Linux that "messes up" the GRUB or Yaboot install, so the GRUB boot window doesn't show up--making it harder to boot Linux. Dual booting an Intel Mac using OSX and Linux, we need "rEFIt" or "rEFInd" . . . which is a boot synchronizer to smoothen the differences between BIOS & EFI . . . and maybe we need "gdisk" it's been awhile since I did it . . . all of this is outlined online by "rodbooks" "How to dual-boot OSX & Linux" . . . the only thing I wouldn't do again is to use Bootcamp to set up the partitions . . . once you do that the partitions can't be modified "on the fly" the way it can in DU. I'd just use DU to partition the disc, install OSX, no use for windows but for those who do, and then the Linux system.