Hi. Post more info. How did you create the 20 gb partition. What other os is installed. I have a pavillion dv6 with vista, 10.5.8 and snow installed. All working well. I created 20gb partion for each osx in vista. Left it as raw. Used partedmagic disc and formatted the partitions using xfs format. Booted with osx disc (ideneb 1.4). Used disk utilty and erase disc using journal extended. Then installed selecting only basic drivers. Hope this helps. All partions show correct size.