How do I share storage while dual-booting Mac OS X and Ubuntu 12.04.1?

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http://askubuntu.com – So I have Ubuntu 12.04.1 installed alongside Mac OS X 10.4.11 on my iMac G5 with powerpc architecture. I only have one internal hard drive and I created a small 5 GB partition on it and formatted it to fat32 with GParted in Linux, but OS X won't recognize it, Disk Utility sees it as mere empty space. I also tried to format it as NTFS and install ntfs-3g on Mac OS X as a plugin toread and write to NTFS but the same thing happens, the partition is seenas mere empty space and thus can't be mounted. I can't even partition anything from Disk Utility because it says that this disk drive is the sta (HowTos)