Does anyone know how do I resize an HFS partition on an eMac?
First go into the MacOS hdtool thingy... disk utils or whatever it is called, and turn off journaling for the filesystem you want to shrink. Then find yourself some linux live CD that isn't way old, and boot the eMac from that. When up and running from the live CD, start gparted and do the resizing. When done, boot back into MacOS and turn on journaling again. You are now ready for booting with MorphOS CD and setting up partitions using the hdtool-thingy of MorphOS.